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  1. #include <stdio.h>
  2.  
  3. int factorial(int x){
  4.       int fact =1;
  5.       for( int i=1;i<=x;i++){
  6.           fact= fact*i;
  7.           }
  8.       return fact;
  9.   }
  10. int combination (int n,int r){
  11.        int ncr=factorial(n)/(factorial(r)*factorial(n-r));   
  12.   return ncr;
  13.   }
  14.  
  15. int main() {
  16.  
  17.      int n;
  18.      printf("Enter the n: ");
  19.      scanf("%d",&n);
  20.  
  21.      int r;
  22.      printf("Enter the r: ");
  23.      scanf("%d",&n);
  24.  
  25.      int ncr= combination(n,r);
  26.      printf("The answer is %d",ncr);
  27.  
  28. 	return 0;
  29. }
  30.  
Success #stdin #stdout 0s 5296KB
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Enter the n: Enter the r: The answer is 1
https://ideone.com/GXJaE5
language:
C (gcc 8.3)
created:
11 hours ago
visibility:
public

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