text: Sum of all products of the Binomial Coefficients of two numbers up to K | Function returns nCr i . e . Binomial Coefficient ; Initialize res with 1 ; Since C ( n , r ) = C ( n , n - r ) ; Evaluating expression ; Driver Code
code: def nCr ( n , r ) : NEW_LINE INDENT res = 1 NEW_LINE if ( r > n - r ) : NEW_LINE INDENT r = n - r NEW_LINE DEDENT for i in range ( r ) : NEW_LINE INDENT res *= ( n - i ) NEW_LINE res //= ( i + 1 ) NEW_LINE DEDENT return res NEW_LINE DEDENT if __name__ == ' _ _ main _ _ ' : NEW_LINE INDENT n = 3 NEW_LINE m = 2 NEW_LINE k = 2 NEW_LINE print ( nCr ( n + m , k ) ) NEW_LINE DEDENT