task 6

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace ConsoleApplication1
{
    class Program
    {
        static void Main(string[] args)
        {
            Console.WriteLine("PLease enter two numbers to satisfy K and N (1<K<N");
            Console.WriteLine("K:");
            int K = int.Parse(Console.ReadLine());
            Console.WriteLine("N:");
            int N = int.Parse(Console.ReadLine());

            if (N < K || N < 1 || K < 1)
            {
                Console.WriteLine("Something went wrong! This does not satisy the condition");
                return;
            }
            int factorial = 1;
            for (int i = K + 1; i <= N; i++)
            {
                factorial *= i;
            }
            Console.WriteLine("\nThe factorial is: {0}!/{1}! = {2}\n", K, N, factorial);


        }
    }
}