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3個不同的自然數,只有下麵幾種情況:①三個奇數,那麼任意兩個之和一定是偶數,②三個偶數,任意兩個之和一定是偶數,③兩個奇數,一個偶數,兩個奇數之和就是偶數了,④兩個偶數,一個奇數,兩個偶數之和就是偶數了.綜上,3個不同的自然數,其中一定有2個數的和是偶數.
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