Question

Write a method fact(int n) to find the factorial of a number n. Include a main class to find the value of S where: 

S = `(n!)/(m!(n-m))` 
where, n! = 1 × 2 × 3 × .................................. × n

Answer 1

import java.util.*;
public class FQS
{
int fact(int n)
{int f = 1;
for (int i = 1; i <= n; i++)
f = f * i;
return f;
}

public static void main(String jk[])
{FQ5 p = new FQ5();
Scanner ob = new Scanner(System.in);
int m, n;
double S;
System.out.print("Enter the value of m: ");
m = ob.nextInt();
System.out.print("Enter the value of n: ");
n = ob.nextInt(); 
S = p.fact(n) / p.fact(m) * p.fact(n − m);
System.out.print("\n\n The value of n! / m! * (n − m)! is: " + 8);
}}