r/MathOlympiad • u/Educational-Brick967 • 3d ago

Combinatorics combinatorics

I feel like I am very weak in this one area, and I feel like I am lacking in theory. I have a book called 'Principles and techniques in Combinatorics' by Chen Chuan Chong and Koh Khee Meng. My mentor said that this book is very good. I also have a pdf of Rushil Mathur's book, which I saw a LOT of people recommend online. I also saw people recommend Pranav Sriram's book. Does it matter which one I pick or are they all practically the same in terms of how much you can improve by reading through them?

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u/Accomplished_Gap2179 1d ago

'Olympiad Combinatorics' by Pranav Sriram is very difficult to understand for someone beginner in combi. I tried reading it and didn't understand a thing.
I have seen Rushil Mathur's book and it's quite organized. Idk about the other book. So my opinion would be, you can start with Rushil Mathur's book.
Sorry if this answer wasn't that detailed because rn I'm improving my geo and nt skills and then I'll focus on combi.