Answer
The union of sets $A$ and $B$ is set $C$, which contains the values that $A$ and $B$ have in common, but any doubles are only accounted for once.
Work Step by Step
Unions are explained further on page 6.
College Algebra (6th Edition)
by Blitzer, Robert F.
Published by
Pearson
ISBN 10:
0-32178-228-3
ISBN 13:
978-0-32178-228-1
Chapter P - Prerequisites: Fundamental Concepts of Algebra - Exercise Set P.1 - Page 19: 140
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