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1) (25 pts) Prove or disprove: if p and q are prime numbers then pq - 2 is also a prime number. 2) (25 pts)

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1) (25 pts) Prove or disprove: if p and q are prime numbers then pq - 2 is also a prime number. 2) (25 pts) Let x and y be integers such that 17|(2x + 4y). Prove that 17|(28x + 5y)

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