Set M contains numbers that satisfy the condition that, if integer x is in the set then x+2x will also be in the set M. If -4 is one of the value in the set, which of the following numbers must also be present in the set M.
I. -12
II. -1
III. 2  Pick
A) I only B) II only C) I and II only D) II and III only E) I, II and III
Notice that we are askedwhich of the following numbers MUST also be present in the set MnotCOULD be in the set.   Now, if -4 is in the set, then -4-8=-12mustbe in the set. Could -1 or2 be in the set?sure no.   I onlynswer: I only.
<result>A</result>
Set M contains numbers that satisfy the condition that, if integer x is in the set then x+2x will also be in the set M. If -4 is one of the value in the set, which of the following numbers must also be present in the set M.
I. -12
II. -1
III. 2