A set of numbers has the property that for any number t in the set,t+4 is in the set. If -3 is in the set, which of the following must also be in the set? I. 9 II. 2 III. 4  Choose the most appropriate option:  A) II,III only  B) I only  C) I,III only  D) II only  E) III only
question is asking for must be there elements.   According to the question if t is there t+4 must be there.   if -3 is the starting element the sequence is as follows.   S ={-3,1,5,9....}   if -3 is not the starting element the sequence is as follows   S = {...-7,-3,1,5,9...}   By observing the above two sequences we can say that 9 must be there in set S.   Answer : I only
<result>B</result>
A set of numbers has the property that for any number t in the set,t+4 is in the set. If -3 is in the set, which of the following must also be in the set? I. 9 II. 2 III. 4