Answer
$$ 1,4,6,8,9,10,12,14,15,16,18,19,20$$
Work Step by Step
The bar means that we choose all of the values not in A between 1 and 20. Thus:
$$ 1,4,6,8,9,10,12,14,15,16,18,19,20$$
Algebra 2 (1st Edition)
by Larson, Ron; Boswell, Laurie; Kanold, Timothy D.; Stiff, Lee
Published by
McDougal Littell
ISBN 10:
0618595414
ISBN 13:
978-0-61859-541-9
Chapter 10 Counting Methods and Probability - Extension - Apply Set Theory - Practice - Page 716: 3
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