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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 :)

Note by Aditya Kumar
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.. ;) Rohit Ner · 7 months, 3 weeks ago

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@Rohit Ner ThanksI I shall start from now itself! (: Aditya Kumar · 7 months, 3 weeks ago

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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. Pranshu Gaba · 7 months, 3 weeks ago

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

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@Aditya Kumar You are welcome :) Pranshu Gaba · 7 months, 3 weeks ago

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@Aditya Kumar Pls share the link Samarth Agarwal · 7 months, 3 weeks ago

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

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

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@Rajdeep Dhingra If u have pdf pls share Samarth Agarwal · 7 months, 3 weeks ago

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@Samarth Agarwal Download it from here Aditya Kumar · 7 months, 3 weeks ago

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@Aditya Kumar Thanks!! Samarth Agarwal · 7 months, 3 weeks ago

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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. Ameya Daigavane · 7 months, 3 weeks ago

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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 Gauri shankar Mishra · 7 months, 3 weeks ago

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@Gauri shankar Mishra Rajdeep had linked me those series of videos Aditya Kumar · 7 months, 3 weeks ago

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@Aditya Kumar Have u seen any of them they are indeed very good Gauri shankar Mishra · 7 months, 3 weeks ago

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Try Brilliant Wikis. Samuel Jones · 7 months, 3 weeks ago

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@Samuel Jones Yes I saw them (: Aditya Kumar · 7 months, 3 weeks ago

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

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

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@Rajdeep Dhingra Do you mind sharing it here too? Thanks! Samuel Jones · 7 months, 3 weeks ago

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@Samuel Jones That video is in Hindi. Do you know Hindi? Aditya Kumar · 7 months, 3 weeks ago

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@Aditya Kumar I do. Link? Siddhartha Srivastava · 7 months, 3 weeks ago

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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! Adarsh Kumar · 7 months, 3 weeks ago

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@Adarsh Kumar Thanks! Aditya Kumar · 7 months, 3 weeks ago

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

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@Mehul Arora Thanks! Aditya Kumar · 7 months, 3 weeks ago

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@Aditya Kumar Here

This might be too easy

Practice all of these

Hope it helps. Mehul Arora · 7 months, 3 weeks ago

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@Mehul Arora I saw many of them. Aditya Kumar · 7 months, 3 weeks ago

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@Aditya Kumar Great, then practice more. All the best! :) Mehul Arora · 7 months, 3 weeks ago

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@Mehul Arora Thanks! Aditya Kumar · 7 months, 3 weeks ago

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@Aditya Kumar btw where are you now? Ayush Shridhar · 7 months, 2 weeks ago

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

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@Aditya Kumar So you wont give any fiitjee test now? Ayush Shridhar · 7 months, 2 weeks ago

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

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@Aditya Kumar Okay! How was mains? Ayush Shridhar · 7 months, 2 weeks ago

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@Ayush Shridhar Bad getting only 200 Aditya Kumar · 7 months, 2 weeks ago

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@Aditya Kumar See this Aditya Kumar · 7 months, 2 weeks ago

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

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@Rishabh Singhal Explore the wiki pages. Aditya Kumar · 4 months, 2 weeks ago

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

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@Aditya Kumar Okay! Ayush Shridhar · 7 months, 2 weeks ago

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