题目信息
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
Ill. 5
A:I only
B:II only
C:I and II only
D:II and Ill only
E:I, II, and Ill
参考答案及共享解析

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已选答案:
正确答案:
D:II and Ill only
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