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設其中最小的一個數為X,如果其它5個數與X的差都不是5的倍數,則這5個數與X的差或者是5的倍數减1,或者是5的倍數减2,或者是5的倍數减3,或者是5的倍數减4, 肯定至少有兩個數與X的差都是5的倍數减Y(Y為1,2,3,4中的任意一個數),則這兩個數之間的差肯定是5的倍數.
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