Question: 4. Prove the given statement by indicated method. (48 points, 16 each) (1). By direct proof For any integer n, there exist two integers a

4. Prove the given statement by indicated method. (48 points, 16

4. Prove the given statement by indicated method. (48 points, 16 each) (1). By direct proof "For any integer n, there exist two integers a and b of opposite parity such that an + b is an odd integer." (2). By Contrapositive "If p is a prime greater than or equal to 5, then either 3 | (p + 2) or 3 | (p - 2)&quot

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