1. Prove each of the following theorems by using a direct proof. (a) The sum of three odd integers is an odd integer. (b) The quotient of two nonzero rational numbers is a rational number. 2. Use a proof by contrapositive to show that if m and n are integers and mn is even, then m is even or n is even.

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A: Thanks for the question :)And your upvote will be really appreciable ;)

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