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. -5
II. 11
III. 6	Select the correct option
A) I only B) II only C) I and II only D) II and III only E) I, II, and III
The question is which of the followingmustbe in the set, notcouldbe in the set.   If -1 is in the set so must be -1-2=-3, as -3 is in the set so must be -3-2=-5, as -5 is in the set so must be -5-2=5 and so on. So basically knowing that -1 is in the set we can say that ALL odd numbers less than -1 are also in the set.   I onlynswer: I only.
<result>A</result>
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. -5
II. 11
III. 6