[Q. ] GWD數學
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
請問這題為什麼答案是D呢？我怎麼想也想不透，謝謝
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