Intersection and union of sets | Probability and Statistics | Khan Academy

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Tru

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KHAAAAAAAAAAAAAAAAAAAAAAN! THIS IS EFFING AWESOME! I can't believe Khan is teaching us about Set Theory. I think he's finally starting more advanced Math. I feel like I am in a dream. I already know most of this stuff but nothing equals Khan's level of delivering a message so I'll watch them all at least three times each. Thank you, Sal.

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Smarter than the people who didn’t look it up

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This is really great Sal! Thank you very much. I sincerely hope you will do more videos on discrete mathematics. If you have some spare time I would like to see a video on the barber paradox, should be a fun brain teaser for all ages.

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My former math teachers ruined math for me. I went from straight A to C due to the fact that they were horrible either in math or in explaining iy

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That’s a bit rude

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These tutors do not have misbehaving students to contend with when they are explaining... Hence it will always be easier than being in a class with disruptive students.!!!!

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+Kevin Garcia a lot to study*

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This was exceptional. I am self studying real analysis rn and I honestly cannot see what the need for over complications when explaining simple concepts like this

[@elixre0660]

1:15 excuse me? "These curly little brackets" Those are braces 😂

[@ibrahim9296]

REAL ANALYSIS !!! Finally))

[@PankajSingh-dc2qp]

What is the intersection of set 1:{t>5} and set 2: {6

[@aasheeb1155]

My god! I was having so much trouble with this, I spent a week trying to fir gurl it out on my own reading the material, I saw this and got it in 1 min 😂🤣🤩🤗

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you saved my life

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A master student and still coming back here to remember such a basic

[@denadagjyzeli1983]

Thank you so much😂 that was very helpful. I never quite understood my teachers in these chapters but you explained it so good!

[@bluebird5352]

great explanation ...really helped..thanks

[@Kage1128]

5:24 Shouldn't you also cover the intersection since you write X union Y = {3,12,5,13,14,15,6} but you don't cover 3 in the drawing.

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Thank you so much for this helpful video ❤❤

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without you sal , i would never get through college !! thank you khan acadamy !!!!

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THANKS A LOT DUDEEE!🥰 I THOUGHT I WAS DUMB BUT MY MATHS TEACHER IS DUMB😂 HE COULDN'T EXPLAIN THIS GOOD!👍🏼

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Thanks for making it so simple! :)

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[@rhoadess]

You guys this is 7th grade math, but it is a stepping stone to more advanced stuff, such as abstract algebra, logic, and set theory, among other things.

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My test is tomorrow and I was struggling with this , but thank you so much you make it so simple

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[@willbelasco]

what if you need to define the intersect and both sets don't share any of the same numbers? how is that defined / expressed?

[@rohaanashraf8589]

mettaworldwill That will give you an empty set or a null set.

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Wow was looking into learning this today, and today this video was made.

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[@Carbon_Crow]

There might be something I'm not understanding but "3" is NOT in x OR y. It is in BOTH therefore it is not in one OR the other. Even in the illustration only the things that DON'T overlap are shaded. (5:21-5:30)

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Am I the only person that’s learning this in ninth grader my sister took it in collage and I’m over here taking it in ninth grade but great video I actually get it now!

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It is technically part of Algebra I curriculum. So, it depends on when you take Algebra I. Most students take Algebra between 7th and 9th grade, depending on their level of mathematical ability.

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I just don't understand how this is useful in life...

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One of the logic used by social media to find common friends between A and B.

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what textbook can i use for this chapter

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Y= myself! Islander stuff. Di Y! Directed intel, or mine! More Islander stuff. Or sets, ops = 3rd derivatives! +4 {7,1} grids. Proof: 7-(4,3)= {3,4-- inverse of, calculus rule!} < detects N/A solutes!

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It saved my life

[@jinxerseven]

SET THEORY!

[@reuben4850]

What is the intersection if there are two of the same number/value in one of the sets, and only one of the number in the other set? E.g. X = {3, 3, 4} and Y = {3, 4, 5}

[@WrathofMath]

It's a little late, but sets are collections of unique, distinct, and unordered objects. So a set cannot have multiple of the same objects. Each element is unique, and all elements are distinct from each other. So if the set X = { 3, 3, 4 }, this is really just a confusing way to write the set, because a set can only count one 3. In other words { 3, 3, 4 } = { 3, 4 }. So X = { 3, 4 }. Then if Y = { 3, 4, 5 }, we have that X intersect Y equals { 3, 4 }. Hope that helps you or someone reading this in the future!

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in year 5 started learning abt dis

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MORE DISCRETE MATH

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THANKS A LOTS

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can you do this on the numberline

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THANK YOU SOL MUCH

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i take furthermaths and understand every topic of it but im here looking for how to do sets to study for maths

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very nice, thank you :)

[@thir13een24]

Anyone else watching this cause they didnt understand it in online class???