GWD1 Q10 求指导~~

半阙

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，我觉得是E呀~   如果-3在这个集合中t=-3,那么t+2不就等于-1了么?






E.I, II, and III
答案是D，我觉得是E呀~   如果-3在这个集合中t=-3,那么t+2不就等于-1了么?





D.II and III only
E.I, II, and III
答案是D，我觉得是E呀~   如果-3在这个集合中t=-3,那么t+2不就等于-1了么?






E.I, II, and III
答案是D，我觉得是E呀~   如果-3在这个集合中t=-3,那么t+2不就等于-1了么?

Happyandhappy

这道题的原因其实很简单的，就是t+2在，但是t-2不在，他说-1在，只能代表-1之后的数会在，就是这样，你考虑的多了一步

半阙

啊~是我没看清题~谢谢啦~