Answer
{ }, {0}, {1}, {2}, {0,1}, {0,2}, {1,2}, {0,1,2}
Work Step by Step
List all the subsets with 0 members { }
List all the subsets with 1 member {0}, {1}, {2}
List all the subsets with 2 members {0,1}, {0,2}, {1,2}
List all the subsets with 3 members {0,1,2}