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Need serious help!

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 :)

7 months, 3 weeks ago

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Try 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.. ;) · 7 months, 3 weeks ago

ThanksI I shall start from now itself! (: · 7 months, 3 weeks ago

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. · 7 months, 3 weeks ago

Thanks I got the PDF. It is really a good book. (: · 7 months, 3 weeks ago

You are welcome :) · 7 months, 3 weeks ago

Pls share the link · 7 months, 3 weeks ago

That book is too expensive. Do you have a PDF of it? · 7 months, 3 weeks ago

I have. I used it for RMO long back. (Again going to start using it :P) · 7 months, 3 weeks ago

If u have pdf pls share · 7 months, 3 weeks ago

Thanks!! · 7 months, 3 weeks ago

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. · 7 months, 3 weeks ago

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 · 7 months, 3 weeks ago

Rajdeep had linked me those series of videos · 7 months, 3 weeks ago

Have u seen any of them they are indeed very good · 7 months, 3 weeks ago

Try Brilliant Wikis. · 7 months, 3 weeks ago

Yes I saw them (: · 7 months, 3 weeks ago

@Sandeep Bhardwaj One your Quick Notes is needed. :) · 7 months, 3 weeks ago

I sent you something on slack. Check it out. Your PnC level will boost 5 times with that. · 7 months, 3 weeks ago

Do you mind sharing it here too? Thanks! · 7 months, 3 weeks ago

That video is in Hindi. Do you know Hindi? · 7 months, 3 weeks ago

I do. Link? · 7 months, 3 weeks ago

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! · 7 months, 3 weeks ago

Thanks! · 7 months, 3 weeks ago

This might help. :) · 7 months, 3 weeks ago

Thanks! · 7 months, 3 weeks ago

Here

This might be too easy

Practice all of these

Hope it helps. · 7 months, 3 weeks ago

I saw many of them. · 7 months, 3 weeks ago

Great, then practice more. All the best! :) · 7 months, 3 weeks ago

Thanks! · 7 months, 3 weeks ago

btw where are you now? · 7 months, 2 weeks ago

I'm in Bangalore. My dad is transferred. I'll come back to Mumbai on 10 May. · 7 months, 2 weeks ago

So you wont give any fiitjee test now? · 7 months, 2 weeks ago

Apparently no. But I'll give the last one on 15 May. · 7 months, 2 weeks ago

Okay! How was mains? · 7 months, 2 weeks ago

Bad getting only 200 · 7 months, 2 weeks ago

See this · 7 months, 2 weeks ago

Can you please tell me some sources on the topics of special functions (polygamma, gamma,etc) and summation...it would be really helpful · 4 months, 2 weeks ago

Explore the wiki pages. · 4 months, 2 weeks ago

Thanks for the reply! But it seems that link is not working now.. · 4 months, 2 weeks ago