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: 15



Work Step by Step

In order to count all the elements in set A, we have to add up the numbers in the circle of A. This means: $n(A)=15+n(A\cap C)+n(A\cap B\cap C)+n(A\cap B)$ $n(A)=15+2+5+3=25$
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