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Grouping Method
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This video explains the gap method or gathri concept of Permutations and combinations.

## Vineet Loomba is teaching live on Unacademy Plus

Vineet Loomba
IITian | No. 1 Educator in IIT-JEE (Maths) | 4 Million Minutes Watch Time | 8+ Years Experience | Youtube: Maths Wallah | vineetloomba.com

U
Ak
Sir live class ullapo telegrqmil parayar undo
10 months ago
Yeah. രാവിലെ മെസ്സേജ് അയക്കാറുണ്ട്
Ak
Anitha k
10 months ago
Ok sir. will check it going forward
Sir, one request - Please separate the answers of these questions in a subsequent slides. When we try to solve questions on our own, its very difficult not to glance at the answers. Thanks for your help Sir
Ps
sir your explanation is really helpful and awesome and I would like you to please tell the concept of questions which have high chance to come in jee
Vineet Loomba
a month ago
Please see my course on IIT JEE strategy it has lesson on important topics for physics chemistry and mathematics also there is a lesson on books and you will find a strategy according to your class and current level of understanding
Hello Sir, I have one doubt here in last example of 10 people. where we ended up 9!*2. but suppose 4 people want to sit together. from my point of view it should be (10-4)!*4!. as 4 people can sit in any sequence and that will lead us to possible combinations as 4!. please correct my understanding if I am missing something. thanks Sandeep
Vineet Loomba
4 months ago
4 people dont want to sit there together ..there bro sis want to sit together...are you asking a nee question?
Vineet Loomba
4 months ago
If 4 want to sit together then it will 7!*4!
Sandeep Kumar
4 months ago
thanks for quick response sir. my question is answer should be 9!*2! or 9!*2. in this situation answer is same. but if we take example that 4 people want to sit together.
Sandeep Kumar
4 months ago
yes. my mistake it will be (10-4+1)!*4!. thank you for your quick response. :) have a nice evening.
SS
very incorrect explanation of 11 batsmen question
Vineet Loomba
3 months ago
Why do u think it is incorrect
SS
in the book of Arun Sharma for CAT a very different explanation is given
Vineet Loomba
3 months ago
You shud check the ques in the book..this is correct explanation and this course if for iitjee.. do let me know wht u think is wrong in my explanation
Vineet Loomba
3 months ago
this is a simple pnc problm...nothing much to be thought of. . u shud check the ques in the book u r refering...
SS
sir it is a question of the same type. but it is explained in a very different manner and the answer is also different. people think that they are always correct. this is not the case always. in a previous video of the same pnc series, I asked a doubt but you did not reply. and now when I am confident that this is wrong then you are replying. you should have also responded when I needed your help
SS
Q. There are 8 orators A B C D E F G H. In how many ways can the arrangement be made so that A always comes before B and B always comes before C.?
SS
it is same type of Question
Vineet Loomba
3 months ago
This is a totally different question shubham ... In my question it is coming just before ... Read the question pls ..and i get so many comments daily .. I try to reply as many as possible :) both the questions ate way different. Think calmly and you will understand :)
Vineet Loomba
3 months ago
One is A before B and B before C means order can be AEBDFC ..here A is before B and B before C ...but when I I say A just before B and B just before then ABC will come together... Hope that answers your query :)
Satyasnigdha Pani
3 months ago
i also had the same confusion,thanks sir,u just cleared it☺️☺️
Vikash Kumar
3 months ago
sir is not wrong Mr. shubham...u must b calm b4 tempering
thanks sir 🙏🙏🙏
1. PERMUTATIONS AND COMBINATIONS JEE MAIN AND ADVANCED (IIT-JEE) IIT-JEE MATHS MADE EASY PREPARED BY: ER. VINEET LOOMBA IITiAN | IIT-JEE MENTOR FoR SURE SHoT SUcCESS IN JEE MAIN AND ADVANCED (IIT-JEE)

2. 100% SUCCESS IN JEE MAIN AND ADVANCED (IIT-JEE) ABOUT ME B.Tech. From IIT Roorkee IIT-JEE Mentor Since 2010. Doubts/Feedback in Comment Section * Comment other topics you want to revise. Follow me @ https://unacademy.com/user/vineetloomba to get updates. Share among your peers as SHARING is CARING !!

3. 100% SUCCESS IN JEE MAIN AND ADVANCED (IIT-JEE) Grouping Methodti Con pt) Ex There are 3 different Physics Books, 2 different Chemistry books and 4 different Maths books. If they are to be arranged in a row such that books of same subject are kept together, in how many ways can this be done. ? 2, 3 MATHEMATICS FOR IIT-JEE ER. VINEET LOOMBA (IIT RooRKEE)

4. 100% SUCCESS IN JEE MAIN AND ADVANCED (IIT-JEE) There are 11 batsmen from A to K. How many batting orders are possible if G bats immediately after A and J immediately after G Aus MATHEMATICS FOR IIT-JEE ER. VINEET LOOMBA (IIT RooRKEE)

5. 100% SUCCESS IN JEE MAIN AND ADVANCED (IIT-JEE) There are 5 girls and 5 boys in a group. In how many ways they can be seated on 10 chairs such that there is pair of brother and sister who wants to sit together. (BS) 91x2 AM MATHEMATICS FOR IIT-JEE ER. VINEET LOOMBA (IIT RooRKEE)

6. 100% SUCCESS IN JEE MAIN AND ADVANCED (IIT-JEE) GAP METHOD ExThere are 4 boys and 4 girls and they are to be seated in a row. In how many ways can they be arranged if boys are at odd places and girls are at even places. MATHEMATICS FOR IIT-JEE ER. VINEET LOOMBA (IIT RooRKEE)

7. 100% SUCCESS IN JEE MAIN AND ADVANCED (IIT-JEE) () If boys and girls are to sit alternatively. Cand 41x41 =526 5 +57 Cuse (ii) if no two girls should sit together 5 MATHEMATICS FOR IIT-JEE ER. VINEET LOOMBA (IIT RooRKEE)

8. 100% SUCCESS IN JEE MAIN AND ADVANCED (IIT-JEE) 5 (iv) Find the number of ways such that not all girls are together H 51u to a MATHEMATICS FOR IIT-JEE ER. VINEET LOOMBA (IIT RooRKEE)

9. 100% SUCCESS IN JEE MAIN AND ADVANCED (IIT-JEE) Ex: 10 persons from A toJ are given. Find the total number of ways of arranging them such that B and C are together, E and F are together but A and J are never together. (8,c) (E,F) Tst 8I21 21 , 1212.21 eg Au gl 2) 2}- 1 212/2/ MATHEMATICS FOR IIT-JEE ER. VINEET LOOMBA (IIT RooRKEE)

10. 100% SUCCESS IN JEE MAIN AND ADVANCED (IIT-JEE) Ex: 4 boys and 4 girls are to sit alternatively. Also it is given that one pair of brother and sister are to sit together. Find the total number of seating arrangements. -Sis MATHEMATICS FOR IIT-JEE ER. VINEET LOOMBA (IIT RooRKEE)

11. REVISION COURSE FOR JEE MAIN AND ADVANCED (IIT-IEE ABOUT ME B.Tech. From IIT Roorkee IIT-JEE Mentor Since 2010. Doubts/Feedback in Comment Section * Comment other topics you want to revise. Follow me @ https://unacademy.com/user/vineetloomba to get updates. Share among your peers as SHARING is CARING !!