Let x, y and z be integers. Prove that (e) if x and y are odd,...

 

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Let x, y and z be integers. Prove that (e) if x and y are odd, then x + y is even. (g) if x and y are odd, then xy is odd. Let x, y and z be integers. Prove that (e) if x and y are odd, then x + y is even. (g) if x and y are odd, then xy is odd.