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题库 / GMATLA-PS-5
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
Ionly
IIonly
Iand II only
IIand III only
I,II, and III
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for any number t in the set, t + 2 is in the set，对于集合里的任意数字（用t来代表这个数字），这个数字的+2(t+2)也在集合里。
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