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#include<stdio.h> long factorial(int); long find_ncr(int, int); long find_npr(int, int); main() { int n, r; long ncr, npr; printf("Enter the value of n and r\n"); scanf("%d%d",&n,&r); ncr = find_ncr(n, r); npr = find_npr(n, r); printf("%dC%d = %ld\n", n, r, ncr); printf("%dP%d = %ld\n", n, r, npr); return 0; } long find_ncr(int n, int r) { long result; result = factorial(n)/(factorial(r)*factorial(n-r)); return result; } long find_npr(int n, int r) { long result; result = factorial(n)/factorial(n-r); return result; } long factorial(int n) { int c; long result = 1; for( c = 1 ; c <= n ; c++ ) result = result*c; return ( result ); }