using System;

using System.Collections.Generic;

using System.Linq;

public class Program

{

    public static void Main()

    {

        int[] arr = {11,12,15};

        int[] arr2 = {11,12,15};

        var list = new List<int[]>();

        list.Add(arr);

        list.Add(arr2);

        // List with 2 int arrays of the same values (11,12,15)

        // try grouped?     

        var grouped = list.GroupBy(x=>x);

        // try distinct?

        var distinct = list.Distinct();

        // still gives me 2, should be 1 unique value           

        Console.WriteLine(grouped.Count());

        Console.WriteLine(distinct.Count());

    }

}