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Grade Prove each of the following statement about the integers [10pts]: a. If x and y are even, then x+y is even. b. If 3n
Grade Prove each of the following statement about the integers [10pts]: a. If x and y are even, then x+y is even. b. If 3n is even, then n is even c. Ifx 7m 8 and y 7n + 8, then xy- 7k + 8 for some integer k
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