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4. Use a direct proof to prove that if n is an odd integer then 7n2+5 is even. 5. Let m,n,p be integers. Use a
4. Use a direct proof to prove that if n is an odd integer then 7n2+5 is even. 5. Let m,n,p be integers. Use a direct proof to show that if m+n and n+p are odd then 3(m+p) is even
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