using System;

using System.Collections.Generic;

using System.Linq;

public class Program

{

    public static void Main(string[] args)

        {

            var n1 =  new List<int> () {1, 2, 3, 4};

            var n2=  new List<int> () {4, 3, 5, 6};

            var n4 = new List<char>() {'1', '2', 'a', 'b', 'c', 'd'};

            List <Tuple <int, int, char>> n5 = n1.Zip( n2.Zip(n4, Tuple.Create) ,

                                        (a, b) => Tuple.Create (a, b.Item1, b.Item2)).ToList();

        }

}

​

​