Find nPr Java

PROGRAM TO FIND nPr


import java.util.*;
  
public class GFG {
  
    static int fact(int n)
    {
        if (n <= 1)
            return 1;
        return n * fact(n - 1);
    }
  
    static int nPr(int n, int r)
    {
        return fact(n) / fact(n - r);
    }
  
    public static void main(String args[])
    {
        int n = 5;
        int r = 2;
  
        System.out.println(n + "P" + r + " = "
                           + nPr(n, r));
    }
}

OUTPUT
5P2 = 20

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