Question: 1. Let n E Z. Prove that 3 + n if and only if 3 | (n2 - 1) 1. Let n e Z. Prove

1. Let n e Z. Prove that 3 f n if and

only if 3 | (n2

1. Let n E Z. Prove that 3 + n if and only if 3 | (n2 - 1)

1. Let n e Z. Prove that 3 f n if and only if 3 | (n2

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