Question

If x and y are positive integers, and are not both even which of the following must be even?

Is it
4(x + y) -2

Answer 1

4(x + y) -2
= 2( 2(x+y) - 1)

any integer multiplied by 2 is clearly even, so .....

Answer 2

It is correct?

Answer 3

I think I just said so.