using System;

using System.Linq;

using System.Collections.Generic;

using System.Collections;

using Newtonsoft;

public class Program

{

    public static void Main()

    {

        var properties = new List<string>() 

        {

            "red",

            "sticky",

            "smelly",

            "brass",

            "hollow",           

            "jingly",

            "heated",

            "sweet",

            "forbidden",            

        };

        var marbles = new List<Marble>();

        var random = new Random();

        for (var i=0; i < Math.Pow(2, properties.Count()); i++)

        {   

            var marbleProps = new List<string>();           

            foreach (var prop in properties)

            {

                if (random.Next(properties.Count() * 2) == 1)

                    marbleProps.Add(prop);

                else

                    marbleProps.Add("not " + prop);

            }

            marbles.Add(new Marble() { Properties = marbleProps });

        }                   

​

        Console.WriteLine("Total marbles: " + marbles.Count());

        foreach (var prop in properties)

            Console.WriteLine($"Working set has {marbles.Count(x => x.Properties.Contains(prop))} marbles with [{prop}] as a characteristic");

        foreach (var prop in properties.Select(p => "not " + p))

            Console.WriteLine($"Working set has {marbles.Count(x => x.Properties.Contains(prop))} marbles with [{prop}] as a characteristic");

        var selectedMarbles = new List<Marble>();

        var selectionMultiplier = 10;

        var selections = marbles.Count() * selectionMultiplier;

        for (var i=0; i < selections; i++)

        {

            var index = random.Next(0, marbles.Count());

            selectedMarbles.Add(marbles[index]);

        }

        Console.WriteLine($"Made {selections} selections");

        foreach (var prop in properties)

        {

            var selected = selectedMarbles.Where(m => m.Properties.Contains(prop)).Count();

            var expected = 1.0F * selections * marbles.Count(x => x.Properties.Contains(prop)) / marbles.Count();

​

            Console.Write($"Selected {selected} marbles with {prop} - expected {expected}");

            if (selected < (1.0F * expected * 0.95F))

                Console.WriteLine($" -> This was underrepresented by {100 - 1.0F * selected / expected * 100}%");

            else if (selected > (1.0F * expected * 1.05F))

                Console.WriteLine($" -> This was overrepresented by {(100 - 1.0F * selected / expected * 100) * -1}%");

            else 

                Console.WriteLine();

        }

    }

}

​

public class Marble

{

    public List<string> Properties = new List<string>();

}