using System;

using System.Linq;

using System.Collections.Generic;

​

public class Program

{

    public enum Operators{

        Add,

        Subtract,

        Multiply,

        Divide

    }

    public delegate int Operation(int x, int y);

    public static Dictionary<Operators, Operation> Operations = new Dictionary<Operators, Operation>{

        {Operators.Add, (x, y) => x + y},

        {Operators.Subtract, (x, y) => x - y},

        {Operators.Multiply, (x, y) => x * y},

        {Operators.Divide, (x, y) => (int)(x / y)}

    };

    public static Random rand = new Random();

    public static void Main()

    {

        var nums = Enumerable.Range(0, 8).Select(x => rand.Next(9)+1).ToList();

        var target = rand.Next(10, 50);

        //target = 14;

        Console.WriteLine(string.Join(", ", nums) + "\nTarget: " + target + "\n");

        for(var i=0; i<nums.Count()-1; i++){

            Console.Write(nums[i]);

            for(var j=i+1; j<nums.Count(); j++){

                Console.WriteLine("\t" + nums[j]);

                foreach(var item in Operations){

                    if(item.Value(nums[i], nums[j]) == target){

                        Console.WriteLine(string.Format(nums[i] + " " + nums[j] + ", " + item.Key));

                    }

                }

            }

        }

    }

}