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标题: gwd1-10 [打印本页]

作者: jamesyl327 时间: 2012-2-7 07:00 标题: gwd1-10

A set of numbers has the property that for any number t in the set, t + 2 is in the set. If –1 is in the set, which of the following must also be in the set?

I. -3
II. 1
III. 5
A. I only
B. II only
C. I and II only
D. II and III only
E. I, II, and III

答案是不是错了啊

作者: robinyue 时间: 2012-2-7 20:52

答案好像是D吧? -1在,1就在,3就在,5就在... 但-3不一定在啊..不能反推

作者: SMARTCATHYT 时间: 2012-2-8 20:47

为什么不能反推呢？

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