Acomic series writer keeps a database of her superheroes, which contains the names
s={apocalypse, beyonder, captain america, darkhawk, electro, firebird, godzilla, hawkwoman}.
the following superheroes are the four most popular:
a={apocalypse, captain america, electro, godzilla}.
the following superheroes are featured in at least 20 of her comic series:
b={apocalypse, beyonder, captain america, darkhawk}.
the following superheroes have appeared in last yearâs comics:
c={apocalypse, captain america, darkhawk, electro, godzilla, hawkwoman}.
write the following subsets in terms of a, b, and c, and list the elements in the set:
a. the set of superheroes who are not among the four most popular but still appeared in last yearâs comics.
b. the set of superheroes who are either featured in less than 20 of her comic series, have not appeared in the last year, or are among the four most popular.