I have to find nCrmod M where M is not a prime number. How can find that. I know that i need to find the inverse modulo but how it is going to be implemented if the number M is non-prime.
Find nCr mod M where M is not prime
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You can calculate it by the memoization nCr = (n-1)Cr + (n-1)C(r-1) for M<=5000. You can visit the link for more info http://discuss.codechef.com/questions/3869/best-known-algos-for-calculating-ncr-m