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4. Prove the following: (a) Prove that n is even if and only if n2 -6n 5 is odd. (b) Prove that if 2n2+3n +1

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4. Prove the following: (a) Prove that n is even if and only if n2 -6n 5 is odd. (b) Prove that if 2n2+3n +1 is even, then n is odd

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