why it's ahowing wrong answer?

general
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question :KC01 Problem - CodeChef

my solution:CodeChef: Practical coding for everyone

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hi @pandey_96

see you are creating an array a[r+1] so, consider the pair (2000000007, 2000000006). Here your code will fail!
so, you can try other approach to calculate the nCr.

have a look : CodeChef: Practical coding for everyone