HCF LCM 1 || Number Systems || Quantitative Aptitude || CAT Preparation 2024

[@pranavcu5788]

You deserve a lot more views! This is the best channel on KZbin for cat prep, others all are no way near compared to yours 🙏

[@gojosan1376]

If teaching is an art, u are an ultra legend master artist.

[@vins686]

audio is pathetic in almost every lecture. Still, the lectures are 10/10

[@prakharkumar4653]

listen on mute

[@namratasingh5634]

@@prakharkumar4653 😂😂😂😂

[@sagardubey3800]

@@prakharkumar4653 it means u listen on mute ? bhai cartoon nhi dikha rha sir jo mute krke dekh rha hai

[@prakharkumar4653]

@@sagardubey3800 aww kid sarcasm word suna hai ?

[@sagardubey3800]

@@prakharkumar4653 han suna na ek bacche se prakash kumar se ! kya bhai khud hi bolta hai aur khud ko hi nhi pata .....Ghajini hai kya tu??

[@tamminenisruthi5170]

The best teacher ever and the best channel for cat preparation..

[@aditisrivastavaas3177]

This is such a great channel I'm glad i found it ❤️

[@heygauravtaneja]

I have a little doubt pls tell me that in 1st qsn sir ne kse bola ki ye coprime no. Hai there sum is 324 vale question me

[@aditisrivastavaas3177]

@@heygauravtaneja wo sir ne sec method btaya h is ques. M hcf already dia hua h or sec method k according hcf humara common tb aega jb ek no co prime ho or doosra no common . To yhii h yhaa ek no dia h or sum dia h to sec no co prime hona chaie.

[@heygauravtaneja]

@@aditisrivastavaas3177 Thankyou so much Mam

[@mdsalmanraghib4253]

Me too

[@abhishekanand6425]

Sir ke full videos quant ke kha par milenge?

[@siddharthyadav9625]

17:56 - We can do this with euler concept- 6 is the Euler number of 18. As the question doest define the numbers, We can take half the Euler number , So we get 3.

[@rajdebnath9681]

bro the last part is difference or perfect square na???

[@rajdebnath9681]

can u tell me which us the last part of the number system

[@36_parthshrimali84]

17:57 the question was asked in CMAT

[@toralm7678]

The concept was explained very clearly. Thank You Sir

[@SoniyaKaur-gi8wu]

Audio isn't even that bad people are saying it is. Loved the lecture. Thank you, sir! ❤️

[@ambesh_here]

Just getting addicted to your way of teaching!! Thankyou so much sir🙏🙏.

[@ojasvagaur6918]

I think I am not going to forget this topic now. Thank you very much Sir

[@shubhadaav4636]

If the audio was clear and audiable , it would have been more helpful but the contents are good

[@ruhi_diaries]

For the first question given here, even before sir used Euler's formula, I applied it since I remembered concepts from factors where he used this formula. I didnt even revise it just got registered in my mind, and that's solely bec sir is extremely clear in his explanation and it gets etched in brain really well. Thank you for making me a critical thinker sir. I just mugged up formulae before listening to your classes.

[@Rahulsharmavi]

Superb,,expressed this topic in this much lucid language,,,thanx a bunch hon'ble Ravi sir,,love from patna

[@scoringwolf]

For anyone wondering, the Euler number mentioned is the Euler totient function.

[@smitachaudhary9519]

Good teaching! For English learning, I like Vidya Guru videos very much. Her all content remained so useful for my many several competitive exams.

[@paridhisoni8502]

sir in many videos audio is not clear, please check sir. THANKYOU SIR FOR PROVIDING SUCH USEFUL VIDEOS.

[@dishantsrivastav1539]

yes please look unto this

[@jairamsr7081]

Firstly, I wish to be Thankful for Honarable Sir.! I'm glad to subscribe this Channel Forever. 😍😊 I have one doubt sir, please help me to overcome this- In Euler no'r determination, During Elimination of prime no's which primes no's to be taken, example- E210=210[1/2][2/3][4/5][6/7], why should eliminate this only why not further, SIR. other than sir, anyone can ans me. Thank You sir.

[@arnav0911]

cz these prime no.are factors of 210 ..

[@praveenregmi8130]

Completed number systems finally

[@priyajain2647]

Ravi sir teach us a very very brilliant concepts and I m really thankful to it .....but along with this I want to mention that these concepts are given in Arun Sharma book not even these there are other good concepts also there .....so I highly recommend u to buy this book of Ravi Sharma those who prepare self.

[@himanshupal5532]

Everything is wonderful except audio quality

[@rohit49..92]

thankyou sir............

[@IPearl99]

Sir 3 and 16 are also co-prime through Euler concept I got the answer as 4 ! Please help

[@abeginnerspov5968]

I guess orderedness or unorderedness doesn't matter since b has to be greater than a right? I mean for 18 (1,17), (5,13), (7,11) are the pairs possible. But in the case of (17,1), (13,5), (11,7); b becomes smaller than a.

[@bhargavjalagam8180]

Same doubt

[@ryzen7-wp7gs]

no you're mixing two concepts (B-a) Such that b>a is only required when we are using subtraction method Otherwise it doesn't matter unless specified in question

[@ryzen7-wp7gs]

we do this because (b-a)should be a natural number only Bcz hcf and LCM and calculated for natural numbers only

[@officiallodhi3967]

Love from Uttar Pradesh

[@shruthinp3195]

Sir, what if it is sum of 3 or more numbers?? what will be the modification in Euler number?

[@suryavoroy3527]

HCF OF A,B = any factor of B-A , but how?

[@shrutigupta6234]

Sound problem 😑

[@Mavone20]

Done ✔️

[@masoodasim8567]

At 24:04 Eulers formulae output is wrong it should be 45 instead of 48 . Sir please check it .

[@anushka2602]

It’s correct

[@goku-nl6cq]

Sir just wanna know AApne sir unit digit of number cover kiya h sir?? Apne unit digit of factorial cover kiya h but normal number like 7^402 what would be the unit digit aise wale questions sir Thank you

[@ranjeetkadam672]

why we considered only co prime number during calculation of hcf and lcf? please answer.

[@ChandrakanthHR]

Bcos you are finding highest common factor. If the number isn't co-prime there is something in common btw them and you can multiply that common factor to your presumed hcf to get actual hcf.

[@ratneshgupta4308]

Great sir thanks

[@neeravd6553]

Can someone tell me in which video has he previously explained the Eular's Approach?

[@Rodha]

Remainders

[@neeravd6553]

@@Rodha thank you sir

[@tusharsaha2726]

The sound quality is very bad

[@ManuSrivastava_]

Thank you so much sir.❤❤

[@anime._.star._]

How he find euler no.?

[@souravpanigrahi6181]

Sir in the last question how can we say that all the pairs should contain only Prime numbers because to be coprime the condition is different I mean they should not have common factor rather than being prime

[@RiyaRajjjj]

Thanku so much sir for all the videos😊

[@dishasingh7482]

Thank you, sir.

[@hemantkumar-uy1if]

Thanku sir for providing video

[@factfile4u]

Sir in question 1 ,you have mentioned 1 and 17 as possible number to get sum as 18 but 1 is not a prime number. .

[@anishtrivedi3160]

co prime means that both the numbers should not have any common factor other than 1, or in other words, their hcf should be 1. It doesnt mean that the number should be a prime number. for example 4 and 5 are co prime to each other, or 9 and 25 are co prime to each other. Hope this helps!

[@suryavoroy3527]

No of coprimes =0.5 times Euler number

[@ManikaGupta-fk9xt]

sir the audio is not clear in many videos

[@divyamahesh143]

Euler no means what it not gives the answer for 1 ques

[@redditfunxf2eh]

watch factor 12 video

[@consumer_55]

some issue with sound. otherwise content is great

[@vishnuagarwal5811]

Can anyone explain how euler number of 210 is find ?and how 2,3,5,7 sir had taken

[@devadevan6112]

Prime factors of 210 are 2,3,5,7

[@dazler98]

Audio is not clear, kindly check

[@indhubora7181]

Sir (3,5) are aslo co prime

[@ansarinehal2025]

Sir audio problem

[@ChandrakanthHR]

Sir, there I couldn't find factors 13. Can anyone help me find it.

[@kushalsheth7879]

Hello sir, it is not necessary that all the coprime nos. found through Euler no. are coprime with each other, is it?

[@someshjaiswal1410]

yes, it is necessary

[@Gautam_OG]

10:00 17:00 25:00

[@growtogether1341]

I covered the above concepts sir but I am not able to solve mocks because they are asking in other concepts.Is these videos enough for number system or any remained sir.

[@harshitchauhan7931]

So hello priyayatham sai were u able to solve mocks by seeing these videos??

[@riya_pragna]

Hello sir , in question where hcf is 18 and sum 384 of 2 numbers .When we apply logic of difference of such numbers=18x ,i.e multiples of 18 and sum of such numbers is 384 , we get 18 possible solutions . why this logic doesnt work here ?

[@ryzen7-wp7gs]

384 isn't a multiple of 18

[@ryzen7-wp7gs]

let two numbers be 18x and 18y So 18x + 18y = 384 ( since both have common factor as 18 we can write them as 18x and 18y ) Now , 18(x+y) = 384 Where x and y are natural numbers . However , 384 isn't divisible by 18 so x+y can't be a natural number And hence the question is invalid

[@aryanchauhan8066]

Thank you sir

[@kshitijbalonie4361]

Thankyou sir

[@nehaaswal695]

Is co prime concept applicable in 3 or more numbers?

[@taranpreetsingh9867]

yes , with the case of 3 or more number we check that each and every pair must be co prime with each other

[@GauravImon]

Can anyone explain me how he solved so quickly in 23:40, 48 as answer.

[@nisbaansayed9155]

His Calculation skills are beyond human imagination

[@anshikabyal7416]

Yaa I also wanna knows how 48 comes

[@ratneshgupta4308]

Thanks sir☺️☺️☺️😃😃

[@srikanths8550]

Thanks alot 🪂

[@manurawat1371]

Sir in the first question why you have not taken 8+9 =17.as two consecutive natural numbers are co-prime.

[@swapneelrao8276]

The total of the those nos. should be equal to 18. Watch it once again.

[@ayushbhargava1062]

Bhai nashe me hai kya 😂😂😂😂

[@c0784]

@@ayushbhargava1062 bhai vo eulers no me 7 tak q gaye h?

[@shreyashwhasale459]

22:41 11 and 199 ❌

[@vickypatil5253]

Sir you teach very well here in English but in unacademy English, hindi mix and casual

[@aryanchauhan8066]

Can I refer the playlist for my gate cs aptitude

[@omamabinsami4436]

Thanku so much sir.. Respect 🔥🔥

[@sjsthomasnick3002]

Hey are you preparing for CAT'21?

[@omamabinsami4436]

@@sjsthomasnick3002 no ,am preparing for CMAT 21

[@sjsthomasnick3002]

@@omamabinsami4436 all the best bro. What other sources are you referring to?

[@spkbusinessD--]

shivam kamat (38) 20-9-2021 thank you sir 🙏

[@abhinavsharma341]

Bro U giving cat this year?

[@ayushshukla6310]

voice is not clear, hard to understand

[@Scholarbear23]

How is a+b=18?

[@shivammplayz4767]

did u get an answer?

[@sohammhatre433]

simply dividing both sides by 18

[@youtubebanme7179]

I just wasted by 20k by joining a shit institution Thank you so much sir

[@aishwaryakshirsagar4298]

In the last question how do i know that all the 24 pairs are co-prime with each other...since we dont know all the factors?

[@ankitranjan9757]

By definition Euler number of a number N is no. of numbers before N that are co- prime to N.

[@sarinayusuf6525]

Please anyone tell me what is Euler number?

[@subhamprasad5587]

Euler ke liye factors wala video dekho.... Number system me sbse phle factors aur remainders dekho .... Mostly sb kuch cover ho jayga... Aur wahi sb use hoga baaki chapters me

[@sarinayusuf6525]

@@subhamprasad5587 thank you

[@mdsalmanraghib4253]

Love your class sir 🤟

[@RiskyIndia]

There is an issue in audio

[@ritikaingale5802]

Sir yeh 210 kaiese aya??

[@jainamhemanee1125]

7a+7b=1470 Divide both sides by 7, a+b=210.

[@pavandheeraj5874]

sir what are variables and how are they orderd/ unorderd

[@Rodha]

Explained in Numbers and P n C.

[@yashchitte1538]

Sir audio is not good.We don't understand anything

[@snaharoy1782]

Sir your audio quality poor....plz improve this

[@fromjeevan]

very bad audio quality but awesome content

[@icecoldnobody3447]

The AUDIO is soooooo badd....but still we need to manage it .(I hope they bring a newer sereis atleast for the next future batches of high QUAILTY.)

[@bikashpatwa189]

Is there any one who has a subscription of unacademy for cat prep. hai toh plz reply

[@harinis465]

Anyone explain that Euler concept couldn't understand that in Q-2)......,......if the no: is 31 how can we find the no; of ways using this concept?

[@priyankakumar7387]

31 is prime,..so for any prime number...it's Euler is = (no. - 1). Then E31 = 30

[@priyankakumar7387]

E29= 28 ...E7 =6 . .°. only for prime numbrs

[@sarinayusuf6525]

@@priyankakumar7387 and what about composite number... Just like in the question no. 2 , the number is 210.. Can you explain, I didn't get the Euler concept

[@subhamprasad5587]

@@sarinayusuf6525 Euler number is generally those numbers before that particular number .. which have nothing in common

[@subhamprasad5587]

@@sarinayusuf6525 For example 10 In prime terms 10 = 5 × 2 .... So any number before 10 .. which is not divisible by 5 and 2 is 10s Euler number Such as 1,3,7,9

[@DhruvZala-j6e]

Sir don't write directly answer after the formula, just solve it all

[@ramchandralad463]

worst audio

[@williamcunninghammorrison3894]

Go to another channel then

[@mihirdhuri5377]

How 6,7 can be co prime? Because 6 is not a prime number!

[@sks98455]

Two consecutive numbers are always co-prime

[@sonnet37]

because the HCF of (6,7) is 1 only .. :)

[@vivekmehatre4777]

@@sonnet37 no similar factors

[@AkankshaSingh-wy5yq]

because they have nothing in common

[@sarmisthamishra5140]

horrible audio

[@cumulusmusic100]

Thank you Sir 🙏

[@sahilsonawane9352]

Thank you soooooooooo much sir❤