Precalculus (10th Edition)

Published by Pearson
ISBN 10: 0-32197-907-9
ISBN 13: 978-0-32197-907-0

Chapter 13 - Counting and Probability - 13.1 Counting - 13.1 Asses Your Understanding - Page 847: 3



Work Step by Step

The intersection of two sets contains all the elements in both sets. Thus the elements are in both sets. Therefore they all are also in either set (because they are in both), hence they all are in the union too, hence it is a subset because all the elements in the intersection are in the union too. The statement therefore is true.
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