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OpenStudy (kirbykirby):
How do you prove "If a|15, then a|30"
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OpenStudy (kirbykirby):
Is it sufficient to say that a|15 => 15 = ka for some k integer. Multyiplying by 2 yields 30 = 2ka , and letting 2k = q, then we have 30 = qa. But this implies a|30 for some q integer , since 2k is an integer?
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