Let a and b be integers. 1. Proof by by contrapositive  the following statement: If a + b is an even number then both a and b are odd or both a and b are even 2. Proof  by contrapositive that a + b is an even number if and only if both a and b are odd or both a and b are even.

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Statements and Logic

Logic is the analysis of general patterns of thoughts without regard to any specific sense of context.