Answer
{ },{5},{10},{15},{5,10},{5,15},{10,15},{5,10,15}
Work Step by Step
Subsets of a 3 member set can contain 0, 1, 2, or 3 members. The subsets include all possible combinations of the members. Thus, we obtain:
{ },{5},{10},{15},{5,10},{5,15},{10,15},{5,10,15}