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