Control Instructions - General Questions

What is the output of the following program?

int day = 2;
switch (day)
{
    case 1: Console.Write("Mon"); break;
    case 2: Console.Write("Tue"); break;
    default: Console.Write("?"); break;
}

What is the output of the following program?

int[] nums = { 2, 4, 6 };
int sum = 0;
foreach (var n in nums) sum += n;
Console.WriteLine(sum);

What does goto case 2; do inside a switch?

What is the output of the following program?

for (int i = 3; i > 0; i--) Console.Write(i);