College Algebra (10th Edition)

Published by Pearson
ISBN 10: 0321979478
ISBN 13: 978-0-32197-947-6

Chapter 10 - Section 10.1 - Counting - 10.1 Assess Your Understanding - Page 687: 22



Work Step by Step

In order to count all the elements in set that are either in A, B, or C, we have to add up the numbers that are in the union of the three sets. This means: $ n(A\cup B\cup C)=15+10+15+ n(A\cap B) +n(A\cap C) + n(B\cap C) + n(A\cap B\cap C)=52$
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