using System;

using System.Collections;

using System.Collections.Generic;

using System.Linq;

​

public class Program

{

    public static void Main()

    {

        var availablePlayers = new List<Player> {

            new Player("Adebayo"),

            new Player("Dragic"),

            new Player("Whiteside"),

            new Player("Winslow"),

            new Player("Lebron"),

            new Player("Curry"),

        };

        // 3 men unit

        var threemencombos = availablePlayers.DifferentCombinations(3).ToList();

        var twomencombos = availablePlayers.DifferentCombinations(2).ToList();

        Console.WriteLine("***********Three men Combos ************");

        threemencombos.ForEach(combination => Console.WriteLine(string.Join(",", (IEnumerable<Player>)combination.ToArray())));

        Console.WriteLine("***********Two men Combos ************");

        twomencombos.ForEach(combination => Console.WriteLine(string.Join(",", (IEnumerable<Player>)combination.ToArray())));

    }

}

​

public class Player

    {

        public Player(string name)

        {

            Name = name;

        }

        public override string ToString()

        {

            return Name;

        }

        public string Name {get;set;}

    }

​

​

public static class Ex

{

    public static IEnumerable<IEnumerable<T>> DifferentCombinations<T>(this IEnumerable<T> elements, int k)

    {

        return k == 0 ? new[] { new T[0] } :

          elements.SelectMany((e, i) =>

            elements.Skip(i + 1).DifferentCombinations(k - 1).Select(c => (new[] {e}).Concat(c)));

    }

}