If the difference is one, then one of the two is

屋漏痕 · 2010-04-01 11:47:04Z

If the difference is one, then one of the two is簡介

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回答: 看看這樣行不行由 mitts 於 2010-03-31 15:49:09

an even number. If it's 2, then the other one is 1 or 3. If it's not 2, then it can be divided by 2. Therefore, not a prime. So it must be 2.

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