T F 5. To prove the statement: If ab =0 then a = 0 or b = 0, you may assume ab = 0 and a # 0 and then deduce that b = 0. If a = 2 (mod 7), then a² = 4 (mod 7). If a¹ = 4 (mod 7), then a = 2 (mod 7). T T F F 6. 7.

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