Answer
All the subsets for the given sets are
{ }, {t}, {a}, {b}, {t,a}, {a,b}, {t,b}, {t,a,b}
Work Step by Step
Empty set is the subset of every set: { },
Single element subsets are: {t}, {a}, {b},
Two element subsets are: {t,a}, {a,b}, {t,b},
Every set is subset of itself: {t,a,b}
All the subsets for the given sets are
{ }, {t}, {a}, {b}, {t,a}, {a,b}, {t,b}, {t,a,b}