text: Function to find binomial coefficient
code: int binomialCoeff ( int n , int r ) { if ( r > n ) return 0 ; long long int m = 1000000007 ; long long int inv [ r + 1 ] = { 0 } ; inv [ 0 ] = 1 ; if ( r + 1 >= 2 ) inv [ 1 ] = 1 ;