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3. Let n E Z+. Prove that the following statements are equivalent: (a) n3 is odd (b) n2 is odd (c)1- n is even (d)
3. Let n E Z+. Prove that the following statements are equivalent: (a) n3 is odd (b) n2 is odd (c)1- n is even (d) n2+1 is even
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