Write a C Program to Find nCr and nPr:

Write a  C program to find ncr and npr

Program :-
    #include <stdio.h>
    
    long factorial(int);
    long find_ncr(int, int);
    long find_npr(int, 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;
    }
---------------------------------------------------------------------------------------------------

Output:

Enter the value of n and r
5
2

5C2 = 10
5P2 = 20