#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 );
}