Видео

Bro I thank you so much

Thank you for this great tutorial

The answer for practice problems is A because there’s only one possibility of 3 juniors and one senior. We can’t have a team only with 4 juniors

Thank you for this! Explained the concepts better than MGMAT for sure

For keeping populations separate, is it for both arrangements and groups or for just groups? Thanks!

Very helpful

You’re a life saver indeed 😊

Hi, For the question with married couple I got answer of 80 instead of 480. Becase, their place is not important, that is why I devided by 480 by 6

In question number 6 does the arrangement of the 2 professors and 3 students in each committee matter? if it does'nt matter shouldn't divide by another two. 840/2= 420? I solved the question exactly the same as you did but I divided it by another two because of the reason I mentioned here. Thank you for the wonderful video by the way!

Bro who is sexykitty123?

Very good!

One of the best videos on combinatorics ever!

I've been struggling a lot with permutations, combinations, and probabilities in the GMAT. I'm still not a pro but this video certainly helped a great deal in my fundamental (rather than formulaic) understanding of the concepts. Thank you so much for this!

From that clear concept. How will I solve this question? Nine students are to have their photos taken, if they are to sit in a row, how many ways of arranging them are possible?

i dont think you had to divide in #5. each of the 15 have to play 14 matches. a playing b and b playing a are 2 distinct matches. so 210 matches will be played.

The third practice problem is worded badly. It says "is to have no two people representing the same country", not "two people or more cannot represent the same country." I thought 3 people, 4 or 5 people from the same country was allowed. To make sure no 2 people represent the same country, here's what I did: 25c4 (all possible combinations) - (5c2 * 5 * 4c2 * 5 * 5) = 5150 ways. Correct me if I am wrong.

very clever way to present combinatorics. Just one question...In the problem that states How many 3 digit integers contain three different digits. Since integers can be positive or negative are you assuming that theses digits are to come only from the positive integer pool? What about the integer - 309. Is that not an integer? Do we need to account also for the three digit negative numbers as well? Thanks

Very very helpful video. Great resource for those looking to improve at Combinatorics.

Thank you for your videos ! Re: problem 2 Group of 3 from 5 married couples + no two can be married. Oops, I could be wrong here but from 10 people you are removing 3 each time. So shouldn't it be 10 x 7 x 4 ?

Thank you 🙏

Thank you very much! I learned a lot!

awesome video seriously thank you

Super helpful! Thanks a lot!

I have got a doubt in that professor and student committee question. Can we connect over gmail??

After hours of watching RUclips GMAT videos, I can say wholeheartedly that you are the best one I found. Humble yet professional, a unique combo in this field. Thank you!!

He just simplified combinations into different way of calculation and people are in awe :D For example question 7 better answered by 10C3-6C3..

This video has cleared all of my doubts.... Thanks for sharing.

Congratulations on your work. Great video. Rds

very very helpful..thank you..

Awesome video!

where is the pdf?

Thank you 😊

God bless you for making this video

how the problem 2 diff from problem 8 apart from the or condtion ?

In the last question, why didn't you multiply the games from each round following the ADD/MULTIPLICATION rule?

Question about problem #3 : integers include negative numbers, but this solution only accounts for positive integers. Did I miss something? Otherwise helpful video thanks!

thanx :)

Great video. Tip for others: for the last exercise you do not need to do any further calculations after having calculated the number of games for the first round ;)

You, sir, are a life saver

This is the greatest mathematical explanation I have ever seen... no joke

Also where can I access your many euro verbal gmat videos?

Please post more videos covering quant and verbal topics. Your videos are so helpful.

This video is top quality! Thank you

This was really helpful Please make more videos.

This is great!!

For Question no: 6 - to for committees 2 professors and 3 students . After you get 840, 840 represent the arrangements and to get the group we divide by 2. = 420 committees. Am I right?

For question 3 . How many 3 digit Integers contain 3 different digits?. Since the question said " integers " and not " positive integers" ., should the answer be (648*2) to include the negative integers of the same set??

Excellent tutorial. Thanks for the wonderful insight. Any chance you create a video to cover Partitions & Permutations ?

This helped me BIG BIG BIG TIME! Thanks man

Great video, great teacher!