using System;

using System.Collections.Generic;                   

public class Program

{

​

public static void RemoveFifthAndSixth(List<int> list)

{

    list.RemoveAt(4);

    list.RemoveAt(4);

}

​

public static void RemoveMultipleofThree(List<int> list)

{

    for(int i=0;i<list.Count;)

    {

        if(list[i]%3==0)

        {

            list.RemoveAt(i);

        }

        else

            i++;

    }

}

static bool isPrime(int x) 

{

        // bool is a boolean type that has value of true/false

        // please implement this method

        for(int j=2;j<x;j++)

        {

            if(x%j==0)

            {return false;}

        }

        return true;

}

​

public static void Printarray(List<int> list)

{

    for(int i=0;i<list.Count;i++)

    {

        Console.WriteLine(list[i]);

    }

}

​

public static void Main()

{

    List<int> list =new List<int>();

    Random rand =new Random();

    for(int i=0;i<10;i++)

    {

        int num =rand.Next(2,51);

        if(isPrime(num)||list.Contains(num))

            i--;

        else

            list.Add(num);

    }

    Console.WriteLine("Generated list");

    Printarray(list);

    RemoveFifthAndSixth(list);

    Console.WriteLine("Remove 5th and 6th list");

    Printarray(list);

    Console.WriteLine("Remove 3");

    RemoveMultipleofThree(list);

    Printarray(list);

}

}