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1. (20 pts) Given n is a positive integer, prove that n is even if and only if 5n + 6 is even. You must

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1. (20 pts) Given n is a positive integer, prove that n is even if and only if 5n + 6 is even. You must use definitions of even (and odd, if needed). Do not use "even plus even is even" or similar rules of thumb

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