#include<stdio.h>
#include<conio.h>
void main()
{
int n,r,i;
long int f1,f2,f3,p;
clrscr();
printf("Enter 1st number, n = ");
scanf("%d",&n);
printf("Enter 2nd number,r = ");
scanf("%d",&r);
if(n<=r)
printf("r must be less than n");
else
{
f1=1;
for(i=1;i<=n;i++)
f1=f1*i;
f2=1;
for(i=1;i<=r;i++)
f2=f2*i;
f3=1;
for(i=1;i<=n-r;i++)
f3=f3*i;
p=f1/(f2*f3);
printf("%dC%d = %ld",n,r,p);
}
getch();
}
///////////////////////////////////////////////////////////////////////////
Copy & paste this code in your TC & run, then you will get output.......
If you have any problem please comment below.........