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标题: GWD1-math1-Q10 [打印本页]
作者: lisaxiong 时间: 2013-12-19 18:15
标题: GWD1-math1-Q10
Q10: A set of numbers has the property that forany 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
下载“GWD31”里面给出的答案怎么是 D 啊?
难道不应该选 E 吗?
求解!
作者: fishsofa 时间: 2013-12-19 19:08
我也觉得是E,同求解!!!!
作者: ken121222 时间: 2013-12-19 19:17
选D
关键在于问题是问must be,
-3符合条件,但不是必须的。
作者: Shawn001 时间: 2013-12-20 12:37
选D,-1可能是这个集合最小的数,这种情况下-3就不在这个集合里。
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