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
            
        Is it
4(x + y) -2
Answers
                    Answered by
            Reiny
            
    4(x + y) -2
= 2( 2(x+y) - 1)
any integer multiplied by 2 is clearly even, so .....
    
= 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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