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1) Use proof by contrapositive If, for a (belongsto) Z, 7a + 9 is even, then a is odd . 2) Use proof by contradiction:
1) Use proof by contrapositive If, for a (belongsto) Z, 7a + 9 is even, then a is odd .
2) Use proof by contradiction: a^2-4b (isnotequalto) 2, for a,b belongsto Z.
You may use the following statement without proof: If a^2 is even, then a is even
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