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任取5個自然數,可能是1.都是偶數,那任意兩個的和都是偶數2.4偶,1奇,其中任意兩個偶數的和一定是偶數3.3偶,2奇,其中任意兩個偶數的和一定是偶數,2個奇數的和也是偶數4.2偶,3奇,其中任意兩個奇數的和一定是偶數,2個偶…
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