Combination

Combination Class

public class Combination{
 public void printCombintion(int n,int r)
 {
  Factorial fact = new Factorial();
  int ncr = fact.fact(n)/(fact.fact(r)*fact.fact(n-r));
  System.out.println("NCR : "+ncr);
 }
}

Factorial Class

public class Factorial{
 public int fact(int n)
 {
  if(n<=1)
   return 1;
  return n*fact(n-1);
 }
}