Answer
$A\cup B = \left\{a, b, c, d, e, f\right\}$
Work Step by Step
$\cup$ represents union of sets.
The union of two sets is a set that contains the combined elements of the two sets,
Thus,
$A\cup B = \left\{a, b, c, d, e, f\right\}$
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 - Chapter 2 Test - Page 111: 11
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