using System;

using System.Collections;

using System.Collections.Generic;

using System.Linq;

public class Program

{

    public static void Main()

    {

        var plates = new List<string>(){ "A", "B" };

        var eventPlates = new string[] { "A", "B" };

        Console.WriteLine("Placas exatamente iguais");

        var result = Case1(plates, eventPlates);

        Console.WriteLine(result);

        result = Case2(plates, eventPlates);

        Console.WriteLine(result);

        Console.WriteLine("Placas diferentes");

        plates[1] = "C";

        result = Case1(plates, eventPlates);

        Console.WriteLine(result);

        result = Case2(plates, eventPlates);

        Console.WriteLine(result);

        Console.WriteLine("Quantidade de placas diferentes");

        plates.Add("D");

        result = Case1(plates, eventPlates);

        Console.WriteLine(result);

        result = Case2(plates, eventPlates);

        Console.WriteLine(result);

    }

    public static bool Case1(IEnumerable<string> plates, string[] eventPlates)

    {

        if (plates.Count() == eventPlates.Length)

        {

            foreach (var plate in plates)

            {

                if (!eventPlates.Contains(plate))

                {

                    return false;

                }

            }

​

            return true;

        }

​

        return false;

    }

    public static bool Case2(IEnumerable<string> plates, string[] eventPlates)  

    {

        var inconsistentePlates = plates.Where(p => !eventPlates.Contains(p));

        if (plates.Count() == eventPlates.Length && !inconsistentePlates.Any())

            return true;

        return false;

    }

}