Question: 6. Let n E Z. Then 4| (n2 + 3) if and only if n is odd. 7. Let a, b, c, d E Z.

6. Let n E Z. Then 4| (n2 + 3) if

6. Let n E Z. Then 4| (n2 + 3) if and only if n is odd. 7. Let a, b, c, d E Z. If a = b (mod 5) and c = d (mod 5), then ac = bd (mod 5)

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