Question 259820
There are 2^6, or, 64 subsets.
Lets look at smaller cases to generate the pattern.
{3} has the subsets: empty and {3} . . . . . . . . . . . . . .2 subsets
{3,6} has the subsets: empty, {3}, {6}, {3,6} . . . . . . . . . . . . . .4 subsets
{3,6,9} has the subsets: empty, {3}, {6}, {9}, {3,6}, {3,9}, {6,9}, {3,6,9} . . . . . . . . . . . . . .8 subsets
so, we see that n elements create 2^n subsets.