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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
5 months, 1 week 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 · 5 months, 1 week ago

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@Rohit Ner ThanksI I shall start from now itself! (: Aditya Kumar · 5 months, 1 week 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 · 5 months, 1 week ago

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@Pranshu Gaba Thanks I got the PDF. It is really a good book. (: Aditya Kumar · 5 months, 1 week ago

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@Aditya Kumar You are welcome :) Pranshu Gaba · 5 months, 1 week ago

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@Aditya Kumar Pls share the link Samarth Agarwal · 5 months, 1 week ago

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@Pranshu Gaba That book is too expensive. Do you have a PDF of it? Aditya Kumar · 5 months, 1 week 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 · 5 months, 1 week ago

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@Rajdeep Dhingra If u have pdf pls share Samarth Agarwal · 5 months, 1 week ago

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@Samarth Agarwal Download it from here Aditya Kumar · 5 months, 1 week ago

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@Aditya Kumar Thanks!! Samarth Agarwal · 5 months, 1 week 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 · 5 months, 1 week 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 · 5 months, 1 week ago

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@Gauri shankar Mishra Rajdeep had linked me those series of videos Aditya Kumar · 5 months, 1 week ago

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@Aditya Kumar Have u seen any of them they are indeed very good Gauri shankar Mishra · 5 months, 1 week ago

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Try Brilliant Wikis. Samuel Jones · 5 months, 1 week ago

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@Samuel Jones Yes I saw them (: Aditya Kumar · 5 months, 1 week ago

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@Sandeep Bhardwaj One your Quick Notes is needed. :) Rajdeep Dhingra · 5 months, 1 week 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 · 5 months, 1 week ago

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@Rajdeep Dhingra Do you mind sharing it here too? Thanks! Samuel Jones · 5 months, 1 week ago

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@Samuel Jones That video is in Hindi. Do you know Hindi? Aditya Kumar · 5 months, 1 week ago

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@Aditya Kumar I do. Link? Siddhartha Srivastava · 5 months, 1 week 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 · 5 months, 1 week ago

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@Adarsh Kumar Thanks! Aditya Kumar · 5 months, 1 week ago

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This might help. :) Mehul Arora · 5 months, 1 week ago

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@Mehul Arora Thanks! Aditya Kumar · 5 months, 1 week ago

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@Aditya Kumar Here

This might be too easy

Practice all of these

Hope it helps. Mehul Arora · 5 months, 1 week ago

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@Mehul Arora I saw many of them. Aditya Kumar · 5 months, 1 week ago

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@Aditya Kumar Great, then practice more. All the best! :) Mehul Arora · 5 months, 1 week ago

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@Mehul Arora Thanks! Aditya Kumar · 5 months, 1 week ago

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@Aditya Kumar btw where are you now? Ayush Shridhar · 5 months, 1 week 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 · 5 months, 1 week ago

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@Aditya Kumar So you wont give any fiitjee test now? Ayush Shridhar · 5 months, 1 week ago

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@Ayush Shridhar Apparently no. But I'll give the last one on 15 May. Aditya Kumar · 5 months, 1 week ago

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@Aditya Kumar Okay! How was mains? Ayush Shridhar · 5 months, 1 week ago

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@Ayush Shridhar Bad getting only 200 Aditya Kumar · 5 months, 1 week ago

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@Aditya Kumar See this Aditya Kumar · 5 months, 1 week 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 · 2 months ago

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

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

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@Aditya Kumar Okay! Ayush Shridhar · 5 months, 1 week ago

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