#include <stdio.h>
// Function to calculate factorial
int factorial(int num) {
if (num == 0 || num == 1) {
return 1;
} else {
return num * factorial(num - 1);
}
}
// Function to calculate nCr
int nCr(int n, int r) {
return factorial(n) / (factorial(r) * factorial(n - r));
}
int main() {
int n, r;
printf("Enter the value of n: ");
scanf("%d", &n);
printf("Enter the value of r: ");
scanf("%d", &r);
if (n < r) {
printf("Invalid input: n should be greater than or equal to r\n");
} else {
printf("The value of nCr is: %d\n", nCr(n, r));
}
return 0;
}