Is there a way to calculate permutations and combinations?

Question

Help me with a code that can calculate permutations and combinations of a given problem

Answer 1

U can make your methods for calculating permutaion & combination
● make a method for calculating factorial
● for nCr , calculate n!/[(n-r)!.(r)!]
● for nPr , calculate n!/(n-r)!

//U can also calculate nPr first & then use it to calculate nCr

fast way to calculate combination :
● make use of formula nCr = (n/r). (n-1)C(r-1) & recursion

Answer 2

Thank you mam