/* * C# Program to Calculate nPr */ using System; using System.Collections.Generic; using System.Linq; using System.Text; namespace ConsoleApplication40 { class Program { static void Main(string[] args) { int n, r, per, fact, fact1; Console.WriteLine("Enter the Value of 'n' and 'r' to find the Permutation :"); n = Convert.ToInt32(Console.ReadLine()); r = Convert.ToInt32(Console.ReadLine()); fact = n; for (int i = n - 1; i >= 1; i--) { fact = fact * i; } int number; number = n - r; fact1 = number; for (int i = number - 1; i >= 1; i--) { fact1 = fact1 * i; } per = fact / fact1; Console.WriteLine("Permutation : {0}",per); Console.ReadLine(); } } } /* Enter the value of 'n' and 'r' to find the Permutation : 10 5 Permutation : 30240