Asked by Benjamin Franklin

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
Answered by Reiny
4(x + y) -2
= 2( 2(x+y) - 1)

any integer multiplied by 2 is clearly even, so .....
Answered by Daisymerolling
It is correct?
Answered by Reiny
I think I just said so.
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