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标题: 大家办我看看这题。。。 [打印本页]

作者: teyvhf 时间: 2004-5-7 15:46 标题: 大家办我看看这题。。。

K is a set of integer of such that if the integer r is in k , then r+1 is also in k . Is 100 in k?fficeffice" />

(1) 50 is in k

(2) 150 is in k

answer: a

作者: liuliyun 时间: 2004-5-7 15:55

思路是：假如r在，r+1在。50在，51就在，51在，52就在。推导100

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