Hi Brilliant!

I have been in a bad form(not in a good frame of mind) recently. That's solely because of my inability to solve combinatorics problems. IIT-JEE is around the corner an I want to get to the level of IIT-JEE (around 250 points problems). I've read many books for IIT-JEE (combinatorics section especially) but still I feel there's some flaw in my understanding of concepts in combinatorics. I do not go to any coaching now as I feel self studying is more important at this time. That's why I'm asking you for help. I do not have deep interest in combinatorics as much I have in calculus. My inability to solve problems in combinatorics has lead to frustration and poor performance in other subjects. I don't want to ruin my IIT-JEE. Please help.

Please share good techniques (which can be generally used for problem solving), theories (which generally come in exams) and some sources.

Another problem is time factor. I don't have much time to read fat books, etc.

Any sort of help will be appreciated :)

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## Comments

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TopNewestTry to understand these by putting a strain on your brain

1.Inclusion Exclusion Principles(very useful for problems involving functions in combinatorics)

2.Derrangements

3.Difference between division and distribution

4.Difference in permutations and combinations of identical and unidentical objects

5.Circular permutations

Yes combinatorics does require a bit of jugglery. Try to solve each and every possible question of combinatorics of previous year jee papers after learning the above concepts. We are always here.. ;)

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ThanksI I shall start from now itself! (:

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I would suggest Principles and Techniques in Combinatorics by Chen Chuan-Chong, Khee-Meng Koh

It covers all the techniques required for JEE combinatorics, and has lots of solved examples.

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That book is too expensive. Do you have a PDF of it?

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I have. I used it for RMO long back. (Again going to start using it :P)

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here

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Thanks I got the PDF. It is really a good book. (:

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Pls share the link

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You are welcome :)

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@Sandeep Bhardwaj One your Quick Notes is needed. :)

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Try Brilliant Wikis.

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Yes I saw them (:

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Okay, since you mentioned JEE only, I'll tell you the way to practice that worked for me - the Archives (past JEE papers). Try solving every combinatorics question, and if you can't, read the theory/solution and proceed. Try this out, and tell me if it works.

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Sir if u have time do watch mohit tyagi on youtube . He is a very good teacher and will be quite helpfull to u in your P & C

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Rajdeep had linked me those series of videos

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Have u seen any of them they are indeed very good

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This might help. :)

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Thanks!

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Here

This might be too easy

Practice all of these

Hope it helps.

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this

SeeLog in to reply

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wiki pages.

Explore theLog in to reply

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Remember these(some of them might be quite easy for you):\[\] 1)Whenever solving P and C probs,this 'mantra' works for me,First,find out the number of ways to 'combinate'(if you know what I mean),and then permute it.\[\]2)Always remember that whenever you are taking product,you are permuting.\[\]3)Try this. \[\] I hope this helps!

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Thanks!

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I sent you something on slack. Check it out. Your PnC level will boost 5 times with that.

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Do you mind sharing it here too? Thanks!

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That video is in Hindi. Do you know Hindi?

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