Combinatorics in Competitive Programming

Since the beginning of my preparation for competitive programming I have seen number of problems based on most important topic of mathematics, that is, combinatorics. Can someone point out a good source for the same. Thank you.

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This Topcoder tutorial would be great place to start combinatorics

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Mott, Kandel, Baker, Discrete Mathematics for Computer Scientists and Mathematicians,2nd Edition,
PHI, 2001.
it is one of the good books you can refer for combinatorics…

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Good ques to ask

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Discrete Mathematics and Its Applications: Kenneth H. Rosen

Thank you. @randomizer

Thank you @sanzzzay

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