Want to know how to become good at combinatorics

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…

begin with this tutorial https://www.mathsisfun.com/combinatorics/combinations-permutations.html

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.https://artofproblemsolving.com/wiki/index.php/AMC_10_Problems_and_Solutions
2.https://artofproblemsolving.com/wiki/index.php/AMC_12_Problems_and_Solutions
3.https://artofproblemsolving.com/wiki/index.php/AIME_Problems_and_Solutions
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