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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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 combinatoricsâ€¦

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Good ques to ask

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Discrete Mathematics and Its Applications: Kenneth H. Rosen