Prove that if the sum of two integers is even then either they are both even, or they are both odd.

I just don't understand proofs at all..

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- Dec 14th 2009, 01:48 PM #1

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- Dec 14th 2009, 06:57 PM #2

- Dec 15th 2009, 01:32 AM #3

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I just don't understand proofs at all..