Give a proof of Let n Z. Then n is odd if and only if 7 n is even. using (a) two direct
Chapter 3, Problem 15(choose chapter or problem)
Give a proof of Let n Z. Then n is odd if and only if 7 n is even. using (a) two direct proofs. (b) one direct proof and one proof by contrapositive. (c) two proofs by contrapositive.
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