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26 April, 11:27

Prove that for all integers m and n if m and n are even then m+n is even

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  1. 26 April, 11:48
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    Use either proof by contrapositives or by contradiction:

    Proof by contrapositive:

    Assume that it is not true that m + n is even. Then either m or n is odd. Since the addition of an odd and an even number is odd, then m + n is odd.

    In this case we show that if either m or n is odd then m + n is not even we prove that if m and n are even, m + n must be even
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