Denver M.

asked • 01/25/16

Proof by contrapositive: If n is even, then 2(n) is also even.

The contrapositive would be:
If 2(n) is odd, then n is odd.
What is wrong with my logic?  The first statement is obviously true, and the second one is obviously false.  I know it must be incorrect to use the contrapositive like this, but why???

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