3.1

using System;
using System.Linq;
using System.Collections.Generic;
using System.Text;
using System.Threading.Tasks;
namespace CSharpLight
{

    public static class Program
    {
        public static void Main()
        {
            int sum = 0;
            int product = 1;
            int[,] numbers = { { 1, 2, 3, 4, 5 }, { 5, 6, 7, 8, 9 } };

            for (int i = 0; i < numbers.GetLength(0); i++)
            {
                for (int j = 0; j < numbers.GetLength(1); j++)
                {
                    Console.Write(numbers[i, j]);

                }
                Console.WriteLine();
            }
            for (int i = 0; i < numbers.GetLength(1); i++)
            {
                sum += numbers[1,i];
            }
            Console.WriteLine(sum);
            for (int i = 0; i < numbers.GetLength(0); i++)
            {
                product *= numbers[i, 0];
            }
            Console.WriteLine(product);



        }
    }
}