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: 19



Work Step by Step

In order to count all of the elements in set A but not in set C, we have to add up the numbers that are in A, not including those which are in C. This means: $= 15 + n(A\cap B\cap C)+n(A\cap B)$ + $n(A\cap C) - n(A\cap B\cap C) - n(A\cap C)=15+n(A\cap B)=15+3=18$
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