Question

Write the set of possible subsets of {-1,0,1}

Answer 1

Answer:

{ { }, { -1 }, { 0 }, { 1 }, { -1, 0 }, { -1, 1 }, { 0, 1 }, { -1, 0, 1 } }

Notice that the original set has 3 elements, so there are 2³ = 8 subsets.  This is a useful check to make sure we haven't missed any.

Hope this helps!