Problems 5, 7, 10, and 15
These are unions; to find the union of two sets list all of the elements either of
the given sets. If an element is contined in both sets (such as 6 and 8 in Problem 5),
list that element only once.
Problems 6, 8, 9, and 16
These are intersections; to find the intersection of two sets list all of the elements
that are in both of the given sets.
Problems 11-14 and 17-18
These are complements; to find the complement of a set, look at the universe
(set U), and list all elements in the universe that are not in the given set.
Notice that Problems 13 and 18 are the same, and so are Problems 14 and 17.
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