Question

If P = {parents and children at a soccer game} and subset S = {children at a soccer game}, what is S′?
a) {friends of children at the soccer game}
b) {children at the soccer game}
c) { }
d) {parents at a soccer game}

Answer 1

see friend S and S' are complements which means everything that is not in S is in S'.
So, the complement of S ,S' is parents at a soccer game (d)