5-2

#include<stdio.h>
double fact(int x)
int main(void)
{
    int m,n;
    double y;
    printf("Enter m,n:");
    scanf("%d%d\n",&m,&n);

    y=fact(m)/(fact(n)*fact(m-n));

    printf("%lf\n",y);

    return=0;
}

double fact(int x)
{
    int i;
    double y;
    y=1;
    
    for(i=1;i<=x;i++){
        y=y*i;
    }
    return y;

}