C n r C n-1 r-1 C n-1 r C n 0 C n n 1. Dry Run of the Program Take input n5 and r3 ncrfact nfact rfact n-r ie. Note - Combination nCr value shows the number of ways to select r things out of n C Find nPr Permutation.
You can choose our ncr calculator to determine combinations.
This code calculate nCr which is n r n-r and nPr n n-r. Where n number of items. How do you calculate nCr on calculator. Now the first approach with which you can solve this Problem is using brute force method and using the expansion of nCr.