The Birthday Paradox

[@Vsauce2]

Hey I just recently passed 4 million subscribers and just wanted to thank each and every one of you!!! Now if you'll excuse me I have a cup of babies to finish drinking.

[@bronsonsnip0r]

the bitdefender link is not working for me :(

[@PunishedSenp]

No problem, you deserve it

[@ukrolelo]

@@bronsonsnip0r me2

[@kumoriani]

You're pretty much the new Vsauce anyway, might as well drop that 2 and make it official

[@gamemak0r]

Hey if I'm born 1/1/1990 1AM GMT +13 and someone is born simultaneously in a different part of the world 31/12/1989 GMT -12 who is older?

[@banquo4223]

To be fair, they're all babies so I assume their birthdays are fairly close together

[@nissad.12]

good point

[@leenmutwakil6350]

Smart 🤝

[@ashokmandal6982]

No, Even any adult has the same possibilities of the same birthdays as the babies , the possibility is still one of 365

[@MarkWatney]

In terms of birth year, Yes. In terms of birth date, No.

[@Neyobe]

Not really. A baby ranges from 0 days to 2 years old I’d say

[@thejesuschrist]

You could say my birthday is a paradox.

[@Greeezy]

Or is it a pair of docs? Hmmmm

[@HuskerFox]

Nice :)

[@kristianhoward2217]

:o Is jesus aeithies?

[@InfernoCatalyst]

Nah, just an illusion.

[@arnodiedrichs3371]

Yes, everyone get's pesents, except you.

[@aqaisback9517]

I love when the intros are completely random due to the lack of context. “I have 23 BABIES.”

[@Creatorsan]

_Erasing babies_

[@flyingdoggo316]

_Makes more babies_

[@the_common_human2201]

_365 minus our 23 babies_

[@Avrauconiteros-Null_One]

@@flyingdoggo316 Lmao

[@FlyingPenguin196]

Wtf give them back

[@Beveyboygames]

There is a much better way for explaining this. Pretend you are in a room of 122 people excluding you, now you have a one in three chance of sharing a birthday with another person, because there are exactly as many people as one third the amount of days in a year, which is intuitive and makes sense. Now here's the trick EVERYONE has a one in three chance of sharing a birthday with someone else in this room because of the amount of people, now 99.99997% make more sense in a room of 100 people

[@nataliawrozek3867]

thank you, I literally struggled with understanding before reading that

[@Beveyboygames]

@@nataliawrozek3867 yeah it only feels paradoxical if you explain it really weird lol, he probably did it to keep the video going longer

[@ElDiosMashiar]

That doesn't feel right

[@goigus]

Another way to explain it is, if you have 23 people, that's 253 pairs of people to compare against eachother, since it's the chance of any two people sharing a birthday. That's way over half of the total days of the year. It's around the same % of doing something with a 1% chance 100 times

[@justin8287]

Man, imagine getting 100 people together to test this theory and then find out no one shares a birthday because you're so unlucky.

[@fridryx8464]

My whole grade when i was in school didnt share a bd the closest was like 1 day apart

[@Half__7]

That's more rare so I guess its cooler

[@cullenpike6314]

Actually that would be extremely lucky bc only like .000001% chance that happens

[@snipergangdrob5940]

@@fridryx8464 My class of 25 has 8/25 kids share a birthday in the 4th grade ofc there was a pair of twins and triplets but 3 other people shared a birthday, (the triplets had a birthday on the same day as some other kid too)

[@hajilove7337]

420 likes. not liking but yeah gagaga

[@mkaylaC1622]

I feel like I just learned everything and forgot everything at the same time

[@zebmiller510]

Welcome, good sir, to Vsauce

[@geraldbal7945]

damn my neurons just grew exponentially!

[@supplant9124]

School basically

[@el.tubenJr]

I watch to much stuff to keep up with it

[@gizmofn1957]

That what it's like taking acid

[@maverick-rs]

Teacher: I have a math problem. Let's say you have 23 babies- Me: A problem indeed.

[@greendinosaurproductions3904]

Lol I'm like #69

[@katstevens2740]

I wanna like but

[@ayrpheli1299]

Mayterdome

[@jakepolls9843]

Maverick Scepurek underrated comment 😂

[@maverick-rs]

@@jakepolls9843 thank you/no ur comment

[@beepduck]

if you are in a room with 50 people, theres a pretty low chance that one of them will share your birthday, but a very high chance that at least two of the other people will have a shared birthday

[@rajveerkanojiya2985]

I understood it with the video but whoever can't they gotta look at this comment and now this reply cause YOU HAVING THE SAME BIRTHDAY AS THE OTHER PERSON AND BY IT I MEAN YOU HAVING SAME BIRTHDAY EXACT SAME SO THE 50% CHANCE WOULD STILL BE WHEN THERE WILL BE 182 BABIES BUT IN THIS VIDEO THEY ARE NOT TALKING ABOUT YOU SPECIFICALLY THEY ARE TALKING ABOUT ANY 2 PEOPLE OUT OF THOSE 23 I HOPE YOU UNDERSTOOD

[@ki_yoon]

Actually, the probability in that case is about 12%

[@zaug1561]

@@ki_yoon 365/50=7.3.....100/7.3=13.6986..... The probability is 13.6986% one of those 50 people will share your birthday. Edit: Disregard this, I'm an idiot.

[@ki_yoon]

@@zaug1561 The correct method of calculation is to compute the opposite case and subtract it from 1. When there are 50 people, the probability that everyone's birthday is different from you is (364/365)^50 ≒ 87.18%, so the probability that there's someone who has the same birthday as you is about 12.82%

[@zaug1561]

@@ki_yoon The chance of 1 person having the same birthday as you is 1 in 365. That seems obvious enough. So the chances of 50 people having the same birthday as you would be 50 in 365. It's that simple. Edit: Disregard this, I'm an idiot.

[@rhinoj]

"If we replace our birthday babies with online passwords, . . ." ( 5:18 ) I didn't expect to hear that sentence today

[@B3XBP0]

Or ever-

[@kaylynnwalsh3311]

who did

[@Penta_I]

So did "VSauce! Kevin here. *I ' V E G O T T W E N T Y - T H R E E B A B I E S* "

[@badkarma6392]

In my basement 😏

[@Zielllo]

So when do you expect it

[@Grandflea02]

"I've got 23 babies" Gengis Khan: *That's cute.*

[@pointzerovr8516]

I had to look him up just to know how many kids he had

[@StolenTorchGuy]

@@pointzerovr8516 how many did he have ?

[@lesymon8483]

@@StolenTorchGuy _and he dissapeared, not sharing the number to anyone and leavong the question forever in the darkness..._

[@thatguykai9140]

@@StolenTorchGuy 14

[@speedwagon_69]

*he populated the amount he killed*

[@bunbunnylopunny1565]

From a graduating class of around 23 people, the oldest and the youngest shared the same birthday just a year apart. No one else in the class did, just them. Pretty cool.

[@emilyhellmueller]

my graduating class has the same situation, but i'm the youngest person! a lot more than 23 people but it's still pretty cool

[@thextremekittenmdj]

wait so how were they in the same grade?

[@emilyhellmueller]

@madapult my birthday is august 30 and so was the other girl's. the district allowed anyone to go into that grade as long as their birthday was before september first, but ultimately it's the parent's decision. so technically, she got held back but not really

[@MarpyPlarpy]

@@thextremekittenmdj It is extremely common for people to start school at both the age of 4 turning 5 and 5 turning 6.

[@InvagPrune]

@@emilyhellmueller same in the uk but with August 31

[@Camilakaki8]

My intrusive toughts are telling me to get 76 people that were born on diffrent days of the year and talk about this video being wrong

[@Culvers420]

i will support your intrusive thoughts

[@hv_2911]

my thoughts exactly :) but realised it would no longer be random as you "selected" people so followed a pattern

[@GokalpCetin-s4t]

I dare you to try by collecting random 76 people on the street and you might get surprised as well :D

[@Camilakaki8]

@@GokalpCetin-s4t bet.

[@bjb1016]

SAME

[@besmart]

Kev, I have so much sympathy for you having to write on a dry erase board while left-handed. The struggle, it is real

[@quolack6435]

True, true

[@GeebleTheGarble]

You realise its the same the other way he just set it up wrong for himself

[@JakeLovesSteak]

I'm lefthanded, and I'm a teacher. I teach in a classroom with a chalkboard. I've stopped writing on the board as much as possible.

[@BardsOnAHill]

It's Okay To Be Smart what makes it harder then for right handed people?

[@premyaragarla3600]

Bards On A Hill We aren’t able to rest our hand on the board, at least comfortably. As you write, you start wiping everything away with you hand because you write left to right.

[@2acommunity]

As a teacher, I confirm this to be true. There is never a year where two students do not share the same birthday.

[@ts214121]

There were 9 birthday pair matches and a 3-way match in my high school class of about 100 students from over 2 decades ago. I wonder what the typical number is for a group of 100 random people.

[@obnoxious.]

That would mean that there is a 100 % chance, so Vsauce's math is wrong. I wish I was your student, I'd have straight As .

[@ganiz2944]

I’ve never had a year where two students did share their birthdays

[@user-ox5ir2rd6g]

@@ganiz2944 horseshit

[@elunxi]

In school I never shared a b. Day with anyone- mine is January 1st

[@satyakamshashwat]

Understood.. so basically, to make sure my password is secure, I should have at least 23 babies...

[@michalsadlowski1938]

Simples!

[@jasonclarkson3246]

Wouldn’t LESS babies be better? Because then there’s less probability of a collision occurring

[@phjorland]

@@jasonclarkson3246 So you mean I am 100% secure because I don't have children? :D

[@THEMATT222]

@@phjorland LOL

[@simonpichna4174]

this guy gets it

[@ScKTM68]

I had this problem in a statistic exam at computer science university, and yes... they asked us also if this paradox would have been useful for softwares and security was the answer. Very interesting topic

[@anthonythompson928]

Wow. I did this as a fun experiment with some people in an online lobby. Turns out I had the same birthday as my twin brother

[@makcuja]

Wow so shocking 😱

[@sam_way2op491]

That's lit bro. Congratulations!!!

[@jgperes]

Woooow

[@stevawesome1424]

Lmao

[@ple8379]

OMG, nooooo! That's so sick, bro!

[@-r-3656]

“I have 23 babies.” *Hold up.*

[@itsreeya3708]

the fact that this comment has exactly 23 likes... this is what i'm gonna cry about tonight.

[@user-ju2bk9ut8b]

It's true, i was the 23 babies

[@SaenzGoG]

223 likes, just saying, I love matches.

[@hugolink0655]

James Bonds constant "woman action" seems to have caught up to him

[@emegaly1526]

Wait a minute

[@joshbray5036]

Worst Villians in 2018 ================= 2.) Thanos - Wiped out 50% of all living thing 1.) Kevin - Erased babies

[@thorjustus5794]

@Ялимон technically, yes. But it's still sad and mean

[@pokemonplace8903]

0. MF DOOM

[@porg3354]

Number 15: Burger King Foot Lettuce

[@mausam6101]

@@pokemonplace8903 0.5 MF Grimm

[@Calfea]

Josh Bray lol

[@musique766]

I respect Kevin for drawing all of those lines just for 5 seconds in a video. Also I am born the 11th of March, pls reply. (i know I am late to the party and I know that Mark Rober is born the 11th of March as well)

[@Alexd0t]

ok so this is crazy, I asked like 9 people and turns out we all had birthdays this year, how do you even explain that?

[@iamjohn2573]

Where did you ask tho

[@OhQueBacan]

@@iamjohn2573 lol, it went over your head

[@nicholasvalentino3291]

Dude this is a next level question

[@youngpyro9711]

Lmao well worded 😂

[@alexassassy5855]

@@OhQueBacan he just not misjudging people and taking for acquired the fact that people should be born within a temporal realm rather than chose their identity as a void intemporal protoss goat

[@thebookworm1613]

Breaks a marker drawing the match lines for 23 babies. Proceeds to use new marker to draw match lines for 100 babies.

[@sigmagamingg420]

lol

[@doszlopleonard6031]

For real

[@jasondeeprose3161]

correct

[@CapMan275]

No because notice no ink was coming out at the end, it was just smearing what was already there.

[@aamori3036]

Ian Lee that’s because that one probably broke too

[@aboboborinha4811]

Imagine him at the store trying to buy this many babies

[@yangsi3389]

🤣😂😂😂😂

[@cuboembaralhado8294]

they sell in packs of 100, I don't know why

[@fakefries5238]

@@cuboembaralhado8294 theres some funky mexican tradition where a baby that represents baby jesus is put in a cake and whoever finds him throws the baby jesus party next year. I'd assume bakers would use them freqeuntly when cooking the baby jesus cakes

[@cuboembaralhado8294]

@@fakefries5238 oh, ok, that makes sense

[@RSpracticalshooting]

@@fakefries5238 we had something similar at the catholic elementary school i went to. everybody got a piece of cake and whoever got the baby won a prize.

[@Tooitoi]

Me and my cousin were traveling some years ago and we found a girl who shared same birthday and name as my cousin. What is funnier it that they both lived on the same state, traveled to another country and met at the same place while celebrating their birthdays.

[@BearPlane747]

W profile picture. RIP Fly high technoblade. Techno never dies!

[@craftworld5641]

I guess they were old twins lost in the crowd🤣

[@Tooitoi]

@@BearPlane747 I changed it lmao but glad someone noticed techno never dies!!!

[@Tooitoi]

@@craftworld5641 yeah it was crazy!! if woulve been even better if they looked alike but the other girl was blonde with blue eyes while my cousin is a tipical latina

[@chloroclymor8388]

He says “343” right at 3:43 Coincidence? I THINK NOT

[@chloroclymor8388]

Idk

[@eman210rocks2]

This actually tripped me tf out but maybe that’s just cause it’s 6am

[@anshulgoyal597]

or is it???? *raises eyebrow in suspicion*

[@kevbri11]

good find my dude

[@Pablogotthesauce]

Also "365" at 4:05 which technically is 3:65

[@blackskull7x]

Can't believe I'm watching this for entertainment

[@aftabhussain4036]

While having an exam tomorrow

[@127ante]

@@aftabhussain4036 you don’t have winter break?

[@konosxg7178]

Why not??

[@ComradeHeydi]

@@127ante yeah? I thought every one did

[@606movedtonewchannelsaeyou5]

@@ComradeHeydi Depends on the country, öy country doesnt have a winter break rn either. It’s ob the 22th January tho

[@corbanspittka4436]

Imagine walking into a room with a single light and a man with a table with like a 100 tiny babies in a circle drawing lines....merry Christmas everybody

[@commenent8313]

200 likes and no comments? Hrm.

[@madisonchapman108]

315 likes and one comment? Hrm.

[@tazhingharib2573]

august 26?

[@nasti8506]

Hrm.

[@tolik_207]

in the whole school, I knew 70 people. and 3 of them had the same birthday

[@BlueJay567]

Weird that it seems everyone is getting recommended this right now

[@uwot9021]

ye

[@kayleigh8069]

merry christmas :)

[@gringerandom5872]

Yeah merry Christmas!

[@BlueJay567]

Thank y’all for the merry Christmas, merry Christmas to you :)

[@junimeme5626]

Probably some weird Christmas timing. Merry Christmas

[@aviksheetdasgupta1149]

Kevin : "I've got 23 babies" Me : Your wife, how is she ?

[@Allu681]

lmfao

[@KaosCurse]

To quote one of my new favorite shows: "Your wife must be so sore." - King Richard, Galavant

[@maisakalboneh2861]

wives*

[@silencekehew6895]

“To shreds, you say?”

[@aviksheetdasgupta1149]

@@KaosCurse 😂😂

[@Fayrayz]

It took me WAY too long to realize that the babies were actual mini baby dolls and not popcorn. This is what happens when it’s midnight and I’m hungry.

[@XDlosDominicans]

they can be popcorn if you want

[@Jen_TheSnail]

Both equally delicious

[@Fayrayz]

@@Jen_TheSnail 0_0

[@itzjagg5030]

@@Jen_TheSnail @fbi

[@MissLilyFae]

Big Kronos energy right here

[@b1oodzy]

For those that are interested, I ran a code 10000 times that ran the experiment with 23 babies and yes, it does come out to around 50%. But what I found more interesting is if we count multiple duplicates that it comes out to around 68%.

[@MrTrevortxeartxe]

Multiple duplicates out of how many people?

[@dominiksipos7836]

I'm not really sure that I understand this, but..... Merry Christmas! After one year... I still don't understand. Merry Christmas!

[@vlad_k0o291]

Happy babys or birthday or holydays...u get the point

[@maddiem1908]

Merry Christmas to you too, Dominik!

[@TailorJulz]

Marry christmas me too

[@tianna_is_online]

merry chrisler

[@nc7880]

Merry christmas :)

[@tigerwoods4034]

I went to high school with about 800 guys and everyday during announcements they would shout of the birthdays. It was not uncommon that nobody had a birthday that day. I didn’t know how statistically crazy this was.

[@nathanbensoni469]

Hmmmm

[@stijnkemper7103]

I rlly need to think to understand this sentence, u could'va said: It was common that nobody had a birthday tbat day😂😂😂

[@PurpleMoon799]

probably in august 😉

[@MaryJane-tp3qd]

My freshman year had 1,800 kids and now I wish they told us people birthdays :(

[@HannaSis]

My school does the same thing and I don’t think that anyone shares the same birthday except for these 3 girls in my class who were all born on the same day, during the same hour 😂

[@ian8298]

_this guy:_ *me:* winning the lotto is 50% chance because you either win or lose

[@chrisguygamesyt9831]

Big brain move there

[@TheAbele992]

Lol I always thought as a kid that every single event had a 50% probability: either it happens or it doesn't.

[@emraldswrd]

@HanHanPlayz huh, do u know what chance means lol

[@miledacruz]

kinda

[@N3KLAZ]

@@TheAbele992 mathematically that's actually kinda true

[@chasechamberlain8721]

I would like to see 100 people come together and have a unique birthday and they are all one day away

[@greta8555]

can’t believe I clicked on this video thinking it was called the britney paradox

[@antoniovergotti1895]

Same_

[@javieraossandon2713]

LMFAOOO I can imagine you being like "why the hell is he putting babies in the table"

[@rbyln3112]

I thought it said “happy birthday paradox” ;-;

[@Helianthus_]

Oh baby baby, how was he supposed to know that something wasn't right here?

[@dr.downvote]

Can't blame after seeing the name Greta! Jk, no offense to you, all goes to Greta thunberg lol

[@kaiserxyozni4786]

Can we just admire that Kevin literarily purchased 100 baby dolls

[@dimi7621]

And also that he gave the effort to put them all one-by-one in place

[@oofers17]

Do you know where he bought those ?(i want little baby dolls)

[@nattidahelsinghof2306]

Jadesketch no but i wan one

[@payton4786]

you can get them off amazon, all the juniors at my school has littered the school with them

[@purgatorian1616]

@@payton4786 must've been inspired by Jordan Cunninghams hiding mini babies video

[@griffincappin8567]

Nobody: People in math problems: I have 23 babies

[@jordanleethebeast5229]

Lol

[@cutiestcutcat514]

alexander Hawk And 49 cribs

[@andrepinho2328]

If Jhonatan bought 134 supercars, Alex train was 45 minutes late and light is faster than sound. How many water cups did Jake drink this week?

[@menacingthinker4322]

@@andrepinho2328 7.657

[@thevigilante401]

I liked and got it to 666

[@lanewisdom6330]

Damn I always watch videos like this just to get half way and realize I’ve just been daydreaming about something else the whole time, now I have to rewatch it haha

[@dylanwoodside3102]

Imagine Kevin going to the store and just buying like 100 tiny babies

[@pavlemilosevic8224]

That's why he order it using vpn and using address of abandoned house 🤣

[@cheekibreeki904]

Sounds just like something he'd do.

[@tonyhakston536]

Imagine this comment without context.

[@heavenwafflesdestroykidwho6142]

100 likes 👁️👄👁️

[@CYB3Redux]

@slam zamillion r/WHATTHEFU-

[@BAC0NWOW]

stares into camera... "ive got 23 babies" this is why I love vsauce

[@nicholaswensink2314]

A lot of people are misunderstanding this, saying something along the line of “but there are 100 people in my ______ and I share a birthday with none of them”. The probability here is saying there’s a 99.7% chance that at least two in the sample will share a birthday not that you specifically will.

[@mulymule12]

Yeh, make's perfect sense with an ounce of thought. 99.7% chance that 2 will share a birthday in a sample of 100, but that still leaves a 1/50 chance that will be you. Or 2%

[@azlan194]

Yeah, a lot of people are confused about it. Another way to put it is like, the probability of SOMEONE winning a lottery this month is very high (almost every month there's someone winning lottery) but the chance of you winning it is almost 0%!

[@MrHasas963]

The first comment i get. But why did two ppl just confirm what does not need confirming? You you think the guys is right, theres the like button.

[@MrHasas963]

@@mulymule12 the way i think you should look at it tho is that there is a 50 %chance from your perspective. You will either find one or not. I wouldnt bother because i dont rly want to meet a 100 babies

[@atriyakoller136]

I am a teacher who teaches small groups of students. I have a birthday on December 31st. And in October I had two groups where I had a student with a birthday on the same day. It was cool.

[@thecubeisalie413]

0:52 in 6th grade there were 23 people in my class and actually two shared the same birthday (mar 10)

[@TheGrimReaperXD]

Gah dayumn

[@Lolek14-vk8rf]

Holy shit mario and luigi

[@BrooklynBwoii]

As long as 70 people are watching this video at the same time, there is a 99.9% chance that they will have the same death day but in different years.

[@lunabirdzzz6604]

Dang. That's my only response I can find in my head.

[@chisinau1302]

Now he's more popular, so more people watch the video at the same time.

[@puginator1612]

*WHAT*

[@SkylarGlider]

deep

[@johnDoeshaveajob]

No?

[@Milestone783]

teachers be like: “you didn’t show your work”

[@venum9663]

“That’s not the correct way of solving the question even though you got the right answer”

[@emsiyes]

"And because of that, I'm giving you an F"

[@speaar]

“And that’s why you lost your job”

[@Kenobisan02]

"The streets are calling my name"

[@raymiller5895]

@@venum9663 I only had one teacher that didn’t do that, she said, “I’ve never seen anyone do it that way before, you got the correct answer. Now let me tell you why that won’t always work. Oh, I’m not marking this as wrong

[@serenecatweather5694]

I can confirm this theory. In my class of 10 people, 1 dude has the EXACT same birthday as I. In another class of mine, of 22 people, someone else shares the same birthday as me too. It’s a miracle !

[@ssvn7vii]

Well my birthday is New Year’s Eve, so can’t relate.

[@mattthedestroyer2804]

That's not a scientific confirmation

[@natetollett5515]

Well that actually isn’t backing this. The chances of you sharing your birthday with someone in your class if 10 is still 10/365

[@Monmon-ve9qp]

that's cool! Our class has 50 students and none of them had the same birthday as me😭😭

[@leafsculpture]

I met someone from my own school who had the same birthday

[@Hussary2004]

One of the greatest videos in this great platform

[@Enrique-Garcia]

"So, when were YOU born?" Oh no you don't, that's how I was hacked last time...

[@Steve-mg8tc]

69 likes on your comment

[@Steve-mg8tc]

Also I was born April 2 do you happen to be botn the same day

[@madisonchapman108]

@@Steve-mg8tc I was born on April 3rd lmao

[@Steve-mg8tc]

@@madisonchapman108 damn

[@hiimty4986]

I’m not relevant but mine is may 17

[@lordjehovah3598]

Vsauce at the shop: Please may I have 75 fake plastic babies please Cashier: WTF

[@geminin6674]

Were they bought from a rubber man?

[@daemichelle]

I thought there was 100?

[@jadenramadhar4340]

He prob thought of that and ordered it

[@itsbunnz5295]

Btw I just wanna day these baby’s are from a king cake, which is a thing in the south and you find baby’s in it, it’s really weird look it up.

[@awesomemantroll1088]

He's the guy we read about in math problems

[@wisdom-for-life]

What will you do with the plastic babies after this video? And where did you find so many...?

[@zionhopkins1374]

U had 69 likes but im evil and made it 70

[@aidenhill4265]

i hid one of these in my metal work classroom

[@dimgera]

A proper baby shower

[@joe_6016_]

He uses them a lot.

[@Zคภ-c1o]

drink it

[@ThatOneCrow3]

interesting how this also explains how real random shuffles don't "feel" as random with both video game maps and songs....

[@girafpanda8886]

“BABIES! ERASING BABIES!” “Alright that’s not good” lmaoo

[@I_Cypher]

Erasing Babies is a cool band name

[@ihatesoup9242]

Ikr

[@wave._.hunter]

Fetus deletus

[@Flackzer]

@@wave._.hunter lmao

[@triciavanandler7285]

Hunter Schoonover I knew that joke would catch up to this eventually

[@liz-ck9pz]

man's lost me when he sneaked a ! into the equation

[@daniaalh1864]

haha the ! means ‘factorial’ - essentially the number multiplied by every number before it. for example 5! is 5x4x3x2x1

[@Generatrix]

@@daniaalh1864 isn't that the same thing but harder than to simply multiply the current number by the previous result? 2x1=2 3!=6 2x3=6 4!=24 4x6=24 5!= 120 5x24 = 120 6! 720 120 × 6 = 600 + 120 = 720 Etc?

[@unlqvt]

@@Generatrix well yes, thats basically how calculating the factorial recursively works, meaning that you need the previous result in order to be able to calculate the next result.

[@daniaalh1864]

@@Generatrix if you’re in the lower numbers then sure but it’s the same thing really. when you get to large numbers like in the question, like 365!, it would be inefficient to sit there doing the work manually when you can use the ! function to get the answer immediately - for reference 10! gives you 3,628,800, so 365! would be an impossibly large number to work with. It also means you don’t have to write 365x364x363… endlessly to get to 1.

[@konica_7396]

I've watched this three times, all in different years and different times, and everytime I am more surprised. Not only by the video itself but also my tendency to forget things

[@stonerbland256]

Damn I was just feeling this

[@mars2_u782]

life takes us on a mysterious road and forgetfulness tend to happen to us as many information are being absorbed into our mind

[@hxhdfjifzirstc894]

An easier way to think about the question is to imagine 365 babies. Would it be at all likely that each one would have their own unique birthday? Hell no, that would be some kind of freak accident.

[@keyara365]

honestly same 😭

[@Red80008]

:D

[@psychelicious5003]

I must be very unlucky then. 3 different sets of 28-30 people I went to school with, and 2 different sets of about 30 people I work with, no shared birthday.

[@user-zt7vm3bb8r]

yeah but in your work or class were there any of them that shared birthday? that's the thing everything isn't about you🙂

[@whatcanidooo]

The fact that so many non-twin siblings share birthdays has always seemed wild to me but now it makes a little more sense

[@spitfire_saint4428]

Nah, their parents just have a "get busy" month. Usually Christmas.

[@tati-anaroseee4316]

My sister has the same birthday as me but exactly 10 years younger and it confuses tf out of me

[@anteriax5175]

Ive got a lil bro 3 years younger with the same bday. I dont feel special anymore :'(

[@SuperSkyhorse]

@@spitfire_saint4428 or valentine's day

[@Connarmankeskateboarding]

My brother was born on February 16th 2010, that’s the same exact date my cousin was born. On top of that my mom and my cousins mom are twins.

[@JVR10893]

“You have the same chance of being born on one of the 365 days in the year”. Press F for leap day babies.

[@hannahharrow8425]

I'm leap day kid 1996

[@fluj5170]

im the party pooper that ruined the 69 like count get rekt

[@familyali795]

@@hannahharrow8425 lets go twin

[@eyesonfiresettopanicatthew276]

@@hannahharrow8425 so.. Ur six now at the end of the month? grats!!!!

[@NPW007]

If you are born on the 29th of Feb than you get to choose the date of your birthday is on the 28th of Feb or the 1st of March

[@GK-dp6oy]

Are we not gonna talk about how he has 75 miniature plastic babies?

[@InfinityChances_]

uhhh

[@nuraxgaming6601]

He's the guy in the math problem

[@amiehueble1880]

lol, you can get these on amazon, my friend and i actually bought these to hide around out school

[@ryanwatkins138]

@@amiehueble1880 haha someone at my school did that too

[@matthewtepedino3332]

he has 100

[@haykgabrielyan159]

The most interesting thing I think this "paradox" shows is that it is not really a paradox but a fallacy, which greatly uses statistics and what we believe is "common knowledge" against us. But not only statistics but phrasing as well. "There is a 50% chance you share a birthday with 23 other people in a group" and "There is a 50% chance 2 people from a group of 23 share the same birthday" are completely different things but can easily interpreted as the same. In this day and age, we should be very cautious not to get manipulated by data and questions, as there is nothing worse than being confidently and irredeemably incorrect.

[@eben7248]

“Erasing babies...” *“...wait that’s not good”*

[@Hh-dz3ee]

I don’t wanna like cuz then it ruins the 69

[@icantswim3123]

Yes it actually is.

[@Amdocool]

My teacher erased my friends hand

[@lightbombs]

i also watched the video

[@davisharper6704]

Well, someone is finally against abortion.

[@Eric-yc7po]

the fact that you actually tried to draw lines connecting all of the babies birthdays >

[@seikomega7298]

Press f to pay respect

[@vile8366]

F

[@trgtheredstoneguy3990]

@@seikomega7298 F

[@Crabgar]

just fill out the circle

[@trgtheredstoneguy3990]

@@Crabgar Wouldn't have been the same...

[@hannahh9]

it took me so long to realize the “babies” weren’t popcorn

[@katongules2346]

I thought they where teeth

[@MetrioGaming_]

I thought they were dogs

[@EXA1024_]

@@MetrioGaming_ wΗαt

[@cjfdnqkn4374]

I thought they were drops of coffee

[@zooeysmith529]

How did you know what i was thinking?

[@276З]

My aunt wanted all her kids to have the same birthday, 2 of them share a birthday, the other 2 are 2 days after the others

[@wateenabutaha4871]

I did not understand a word besides babies and birthday 👍🏻

[@evangelinegamali3374]

Seseme seed

[@husseinazher]

Me2

[@applepie1272]

oh Babies and Birthday's are TIGHT

[@lucytenden7975]

that’s bc he was trying to make it sound cool and confusing by calling them babies when he rlly means any human not just babies. But if u think about it, obviously there’s a big chance 2 out of 100 people would have the same birthday out of 365 days just not born on the same year.

[@hicrhodushicsalta4382]

@@lucytenden7975 that's cause it's simple probability (n/k) everyone does this in 9th Grade or so...

[@nanee500]

My brother and sister who are two years apart were born on the same day and last year my family bought a cat... It was also born on their birthday.

[@GreekGirl102]

yea and I know a couple different families whose father or mother share the same birthday as one of their kids

[@McFlegmato]

My brothers 2 daughters share their birthday 2 years apart first one was a few days late second one was a bit to early

[@MilesHemingway]

9 months after your dad's birthday I'm guessing

[@Pluggit1953]

I have just one nephew and one niece - my nephew shares the same birthday as me and my niece with my father (her maternal grandfather). I wonder what the odds are of three generations of a family sharing birthdays.

[@dokwalk]

@@MilesHemingway i was gonna say anniversary lmao

[@stone1290]

Kevin: "VSauce, Kevin here!" Kevin: *_"I've got 23 babies!"_* *Jesus Kevin what happens after the show?...*

[@just-A.randomdude]

😂😂😂😂lol

[@zalzinglopez2158]

u mean before

[@stone1290]

@@zalzinglopez2158 I mean after

[@stone1290]

Although I guess before future episodes too so?...

[@therealone3536]

Unlimited Stone9 why not both!

[@lepuluke]

I still can’t comprehend this. Why is it thou that we have hundreds of friends but no one shares the same birthday?

[@MonkeShrubb]

Incredibly, unimaginably unlucky

[@MikeyBarca02]

*Okay so here's a quick test:* My birthday is on 16th January and I wanna find out how many people share this day with me. To see how big the chances are, we need to know how many will participate in this. So if you like that means you participate. If we share the same bdays, you need to comment that. And now _let the games beginnnn_

[@lauredanax]

I was born th 16th of January of 2002 :o

[@kearth5249]

one of my close friends is the 16th january :D

[@MikeyBarca02]

@@lauredanax no way 2002 is my year too I just didn’t mention it, I got a twin out there lmaoo

[@pflaffik]

Close, one of my ex born May 8th. Wow it must be true then, now i think its weird we dont we all have the same birthday! Because, more than a billion Chinese do, they all got birthday on Chinese New Year, hows that for a coincidence?

[@MikeyBarca02]

@@pflaffik I’d say that 9 months prior to the Chinese New Year is when a lot of pregnancies start for some reason. And what could also be the case, is that if a lot of immigrants live there, the time they entered this country they could basically pick any day and say it’s their birthday, hence why many peoples birthdays are on the 1st January

[@Lessthanthree]

Funny story... On my first day of Kindergarten, the first person I befriended in my class was a girl who sat next to me and we had the same exact birthday and we were born in the same hospital two hours apart from one another. What are the odds right?

[@nexway9173]

Well apparently 50% XD

[@aperson1218]

I was born in the same hospital on the same day as a girl in my class with the same name as my best friend

[@nyct0phile]

i was good friends in kindergarten with a girl named kaila (my name was kayla, different spelling, same name) who had the same bday lol. not the same but kinda cool

[@frith.calluna]

My best friend was born 1 day before me and took up the last spot in the hospital. I was born at home because there was no more room lol

[@monica7325]

how did u know the hospital u were born in in kindergarten 😟

[@unboiledegg5765]

2:50 “Babies.......... erasing babies....... Ok that’s not good” -Kevin 2018

[@MaxTheCat-eh5ts]

Unboiled Egg oof

[@mechacode8527]

Wow... I have read comments that claim to see a comment quoting the guy in the video in the exact time the guy in the video says it... I thought it was very hard for that to happen, but that has just happened to me with your comment.

[@KitsuneCentral]

Mr. VSauce, I don't feel so good.

[@gqh007]

Fetus deletus

[@GarfieldPhone]

Abortion

[@RyanDepauloDegenerateGambler]

It’s like hitting a 23 team parlay on 95+ % favorites so it actually makes sense

[@Mihail-Prihoda]

[@boytalker3778]

Should we ignore the fact that u have 75 figurine babies lying around in ur house

[@RoanRetro]

Just wait, he has even more later in the video.

[@musingvagabond]

i have 150 whats ur point sir

[@almostoneword]

That's not his house. Nothing to see here, move along. 🤣

[@surayaa5680]

Who doesn't?

[@snailinashell]

Boy Talker no he has 100 lol

[@laloreyes7017]

me: what’s the wifi password friend: it’s on the back of the router the back of the router: 6:17

[@nathanharding5259]

Pineapple Underrated comment

[@tan5184]

lmaooo

[@valscripted]

Pineapple this is so accurate 😂

[@Dizee.]

7:22*

[@johnmendeja1777]

Bruh the password is 12345?? Dat wrong

[@CarlaSofieFM]

Him: *pours tiny babies onto table* "Ive got 23 babies" Me: "Cool"

[@eziesan6362]

Drengerøv

[@hencodelange9289]

He's the guy from the math problems

[@pengii6804]

Bruh subscribe

[@obviousb8508]

Oh damn fr?

[@sprsn1279]

There used to be 24

[@N00dle_Din0z]

I’ve met HUNDREDS of people, and none of them share my birthday

[@paulauchon5455]

You don't understand probability... what is define here is the probability that those 100 people share 1 birthday amongst them, not you alone. there is a 99.9999693% chance two of them share a birthday, while there is less than 27.3% chance that you share a birthday with 1 of them

[@LineOfThy]

Not what data is representing

[@WearyFeline]

Somebody record this but every time he says baby it gets faster and more deep fried.

[@draft1643]

Why did you have to ruin this for me

[@Berilia]

*B a b y*

[@dyingiightz]

Put in the link

[@zdxns]

Your wish is my command

[@hensolo8825]

.

[@chaoticatom6150]

“Erasing babies”-*the guy in a sing song voice* *2 seconds later* “Wait thats not right”

[@FunnyLittleSillyLittleMonkey]

That fact that this video was released over two years ago and you still got 28 likes in six hours makes you think, that either there were at least 28 new people that just watched this video in the span of six hours or that 28 people have been in a coma for the past two years and are catching up on v sauce, well there are more possibilities but I liked the come idea

[@The_Cute_Raccoon]

Oh no Oh no Oh no no no no no

[@thebigmoizt3270]

It’s was actually less than 2 seconds

[@tibees]

When you discover plastic baby shower accessories on eBay

[@texxylady]

I saw those at the dollar store about six months ago and the geek in me got uberexcited

[@RazorM97]

lol, u kiddin

[@themothman4935]

They are also on wish

[@abranbsingh1024]

hey...long time Ms hendy... i hope that cat's okay!

[@Akotski-ys9rr]

Im thinking about school right now since each class has about 25-30 kids. I’ve never seen someone with the same birthday as me at least that I know of

[@violetforyou612]

Me Celebrating Birthday Random Strangers around the world: *Our Birthday*

[@におざごす]

*COMMUNISM*

[@FirstnameLastname-uo3yu]

@@におざごす Someone Called we?

[@kennethmalloy3437]

This is Mother Russia in a nutshell

[@josephstalin364]

Me: Has a birthday cake My siblings: OUR CAKE

[@GizmoHey]

A friend of mine shares the same birthday as me. So Yes it's OUR BIRTHDAY

[@Enaronia]

Even though I have more than 23 students, it was still weird when two kids with the same name had the same birthday. And the third kid with the same name, but spelled differently, had his birthday the day before the other two.

[@starxlight7065]

thats crazy!

[@diavolo4577]

Creepy.

[@jennaa.1645]

In high school, I sat at a table with 3 other kids that shared the same birthday as me. We were also all born an hour apart from each other!

[@daychild_]

@@jennaa.1645 I once sat at a group with 3 other people and they were all exactly one month apart from each other, with me being the oldest 🥲

[@Blitzkit]

Imagine you being around with other 364 people and found out that none of you shared any birthday.

[@masonchristian2311]

even crazier, imagine it was 365 other people

[@CW-xn1ot]

@@masonchristian2311 leap year, clever

[@aidanzeitz4940]

@@masonchristian2311 even even crazier, imagine if it was 366 other people

[@proso1211]

The chances are almost impossible that you should probably get a lottery ticket is would be probably less than 0.000000000000000000003 percent

[@bhupinderkaur5373]

Party everyday!!

[@xandror]

I find it unsettling that so many people don't see the difference between having the same birthday as someone else in their class, versus any 2 people in their class sharing a birthday.

[@noone3216]

Yes, well, a lot of people out there don't watch these types of videos because they're intelligent enough to understand it - they watch these types of videos to **feel** intelligent and, if lucky, remember enough of it to repeat parts to others and **appear** intelligent enough to understand it.

[@clairehindrup]

I can’t believe I’ve literally never seen this person or this video before and it is being recommended to me on my birthday

[@btwitsnobi]

Belated happy Bornday ♥️

[@noahburns6042]

Happy Birthday for the past and future

[@Shadow-Presentations]

The probability of that happening is less than 1/365

[@noahburns6042]

@@Shadow-Presentations woah, your so cwever

[@Shadow-Presentations]

@@noahburns6042 thenk wu

[@Brendanj101]

There is probably a guy out there that knows 1,000 different people, but none of his friends share the same birthday as him. Because he has no friends. Poor guy.

[@tron7_]

Brendan J they’re all anime girls

[@TheItuber]

But even most anime girls have birthdays, doesn`t disprove his second point though.

[@joeynass6997]

I think its me...

[@tron7_]

Fujiwaro nai Makou you right, take spongebob for example

[@neojet280]

Bold of you to assume I was born

[@ultrabaconbroxddd572]

C R E A T E D

[@noeliadiaz4176]

I never DID

[@ObjectsInMotion]

Macbeth is that you?

[@izickbell3138]

personally i mas made in a lab

[@angelemmanuelperezmuniz1474]

So you too are part of the club of the people removed by surgery from the mother's womb?

[@rufuspipemos]

This explains why, as a kid, I would get many baseball cards of the same player after buying just a few packs, even though there were1,400 players in the MLB.

[@mb4lunch]

I was born on the exact same day my mother gave birth! Amazing!

[@arandomperson7141]

Really!? Me too!

[@Crabgar]

Do you also have a birthday next year?

[@arandomperson7141]

@daniel hunt Same!

[@rishabhsolanki7136]

Were you by any chance born in November ?

[@arandomperson7141]

@@rishabhsolanki7136 nope, I'm July

[@MontajBlaze]

I always differentiate probability equations like this by just saying "do we roll the dice once"(like one specific baby here), or" roll the dice many times". It helps get the idea across for me.

[@TOOLandNINfan]

I've used this same technique to help a game designer that used multiple dice. Built an Excel sheet showing odds of getting a target number that could be adjusted. Then showed results for all 6 base dice (D4,d6,d8,d10,d12,d20) while rolling 1 through 4 dice.

[@hitaaran35]

Anyone else open comments to find someone who shares their birthday?

[@denkortagiraffen8947]

Yea me

[@typicalfurry2747]

Dammet

[@kjxnz]

2.23

[@kaisteinsiek6946]

@@kjxnz 9.23

[@dloftin4857]

7.21

[@JarlHolta]

The probability is arguably higher than what you solved for, if we allow cases where we do not "stop at 2", we check further if two other babies have the same birthday in that group as well, and so on. Now if we sum it up we end up at 20 people is on average needed to generate a 50.5% chance of shared birthdays, due to multiples groups at times. There are other cases as well that can further increase such a number, say 3+ share the same birthday as well.

[@mattson4552]

kevin- "I've got 23 babies" *FBI OPEN UP*

[@jarenfoster9409]

XD

[@JackyDacky]

*-FBI OPEN UP-*

[@peneloperose1856]

Mattson Claybrook hahahahhah

[@jacktierney3245]

one mother, or...

[@caritahearts2405]

Kevin: *takes sip of mug* *23 babies fall out of mug* Me: delicious

[@omgitsLindsay]

I watched this for 2 full minutes before I realized they weren't popcorn

[@luccck]

What It has to be popcorn

[@KingTv.]

What do you mean? They are salty, just like pop-corn, so basically pop-corn.

[@melwinaxelsson1871]

@Linds Lol same here 😂

[@alliedatheistalliance6776]

Same, I ate 5 of them before I heard them crying

[@gabrielandjosh2305]

Allied Atheist Alliance lol

[@brad2751]

So no one is gonna crack a joke about him drinking babies at the very start?

[@RafaelMunizYT]

When I saw him drinking babies I thought it was kinda sus

[@akazienoel2009]

Well.. you are- In an informatic way though

[@themysteriousmoomoo3116]

Biden?

[@teszter704]

Will he have baby's-breath afterwards?

[@chrismanuel9768]

Ha! Drinking babies sounds like you're talking about chugging cu-

[@AnnaLarson-f6f]

I just need 1 week, 366 babies that were not born on a leap year, and I'm certain I can find a match.

[@kuttispielt7801]

So how many babies do you want? Vsauce: yes

[@sebastianstan9655]

Chinese/Indians : *YES YES YES*

[@robertpietraru1939]

@@sebastianstan9655 xD

[@pianoguy9300]

So... vsauce is sexchatting? Vsauce: *Yes*

[@Mr_Bones-yf1sw]

New drinking game idea! Every time he says either birthday or baby in this video take a sip!(If you end up in the hospital say it was the guy above or below me)

[@tigershark8867]

@@sebastianstan9655 The Chinese have a two-child policy tho... They want the extra babies for lunch then?

[@raphaelcestari272]

Kevin: So let's skip leap years to make it easier People who were born in February 29th: Maybe I don't exist

[@sazshedevil]

Its actually not too rare either 🙂

[@KaityKat117]

Fun fact, with a rate of 0.0509%, and a current global population of (uvgs) 7.8bil, that means there ought to be approx. 3.97mil people on earth born on February 29th. which sounds like a lot but out of 7.8BILLION (with a B) people, it's really not.

[@stacksmack]

My birthday is on this day...ie 29th feb

[@azzanporter4377]

Wait so then do you celebrate it on the 28th or March 1st

[@KaityKat117]

@@azzanporter4377 My guess is probably similar to my brother (who's birthday is Dec 25th) could be day before could be day after, could be a week, just whenever works best in the moment

[@scptime1188]

For everyone saying "I haven't met anyone with my birthday", think of it like this; the chances that two random people in a group of 23 share _any_ birthday is 50.7%. The odds get lower if you require they share one _specific_ birthday.

[@jedediahgordon4064]

and meeting that person you would then have to factor in population

[@nidhikih2451]

That's right, is the probability of a random person sharing a birthday with another random person, not a random person sharing it specifically with you. You probably have never met someone with your birthday, but you surely know two people that share their birthday, which is the probability the video talks about.

[@timothyhenderson1914]

Also there’s a 49.3% chance no one in that group will share a birthday...

[@scptime1188]

@@timothyhenderson1914 Well, only if the group size is 23. But yeah, that's also important to consider.

[@scptime1188]

@@nidhikih2451 Yup!