combinationsWithRep

Calculate the number combinations in a population size n, whilst selecting k items

int combinationsWithRep(int n, int k);

will return the total number of unique combinations in a population size n, whilst selecting k items that can be repeated. There is no custom return type, the function always returns an integer.

combinationsWithRep(4, 2); //10
combinationsWithRep(5, 3); //35
combinationsWithRep(3, 2); //6