We are aware of the Binomial coefficient, which is a mathematical term used to represent the number of ways to select a certain number of items/objects from a larger set, without regard to their order. It's denoted by a symbol C(n, k)(n choose k or n over k). It gets computed by following formula: C(n, k) = n! / (k! * (n - k)!) The C++ implementation using the above formula is: int factorial( int n) { if (n <= 1 ) return 1 ; else return n * factorial(n - 1 ); } int binomialCoefficient( int n, int r) { if (r > n) return 0 ; int numerator = factorial(n); int denominator = factorial(r) * factorial(n - r); int result = numerator / denominator; return result; } int main() { std::cout << "Value of C(" << 5 << ", " << 2 << ") is " << binomialCoefficient( 5 , 2 ) << "\n" ; } So, the number of ways to choose two i