Answer
The solution is provided in the picture.
Work Step by Step
$A\cup B = B$
For this to be true, $A$ has to be a subset of $B$.
The solution is provided in the picture.
Thinking Mathematically (6th Edition)
by Blitzer, Robert F.
Published by
Pearson
ISBN 10:
0321867327
ISBN 13:
978-0-32186-732-2
Chapter 2 - Set Theory - 2.3 Venn Diagrams and Set Operations - Exercise Set 2.3 - Page 83: 167
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