Question: An integer n is even if and only if n = 2k, for some integer k. An integer n is odd if and only if

An integer n is even if and only if n = 2k, for some integer k. An integer n is odd if and only if n = 2k+1, for some integer k. Use a proof of the contrapositive to show that if the product of two integers x and y is even, then x is even or y is even.

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