Want to know how to become good at combinatorics

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I want to know how to get good at mathematical skills …like combinatorics, permutation etc which are usually asked in contests because brute Force always gives TLE and I could not derive any formula which can solve the problem in seconds

Please share where to go to get good at those skills

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Go through some problems with tag combinatorics. Maybe the editorials of September 19 challenge will help…

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begin with this tutorial Combinations and Permutations

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Somebody please write a good answer on this!!! I have the same problem!

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solve questions on aops(AMC and AIME exams of usa math olympiad) and solved previous year pre-rmo papers(indian math olympiad selection first stage).
1.Art of Problem Solving
2.Art of Problem Solving
3.Art of Problem Solving
4.https://olympiads.hbcse.tifr.res.in/how-to-prepare/past-papers/

These sources contain all type of math but just solve number theory and combinatorics problems and combinatorial probability questions as other topics are generally not required in CP

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102 combinatorial problems by titu andreescu(probably misspelled that) is a great source for combi problems