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标题: GWD-1-Q10 [打印本页]

作者: grace_wang 时间: 2008-8-4 07:20 标题: GWD-1-Q10

Q10:

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D, -3不是？？？怎么解释啊？

作者: greattaste 时间: 2008-8-4 19:39

只能从-1往后加,不可回推

作者: grace_wang 时间: 2008-8-5 06:41

原来是这样啊

看来思路得改了

多谢这位仁兄了

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