List the subsets of: .
Answer: . . . . . Right!
Here's way to ensure that you have all the subsets . . .
First of all, a set of elements has subsests.
Your set has elements, so there are subsets.
Make a chart with 8 rows . . . and 3 columns (one for each element).
In the first column, write four a's and four blanks.
In the second column, write two b's and two blanks, etc.
In the third column, write one c, one blank, etc.
The eight possible subsets appear in the eight rows.