Any editorial for Inverse factorial...?

general
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1

i have been trying to solve the problem of calculating nCr (combination problem) for large values of n. i encountered with a term Inverse factorial as mentioned in this editorial, but it is not at all clear for me… :frowning:
http://discuss.codechef.com/questions/3869/best-known-algos-for-calculating-ncr-m

plzz help…!!

2

link to calculate reverse factorial.

3

Modular inverse and Inverse Factorial - YouTube This video explains how to compute inverse factorials mod some number. Hope this helps.