static void Main(string[] args)
    {  
      showNpoint(25);
      Console.ReadKey();
    }

    private static void showNpoint(int count)
    {
      Random r = new Random();

      string[] strE = { "A","B","C","D","E","F","G","H","I","J","K","L","M","N","O","P","Q","R","S","T","U","V","W","X","Y","Z"};

      for (int i = 1; i <=count; i++)
      {
        for (int j = 1; j <=count-i; j++)
        {
          Console.Write(" ");
        }

        for (int k = 1; k <= 2*i-1; k++)
        {
          Console.Write(strE[r.Next(0,25)]);
        }
        Console.WriteLine();
      }
    }