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: 16

Answer

20

Work Step by Step

In order to count all the elements in set B, we have to add up the numbers in the circle of B. This means: $n(B)=10+n(B\cap C)+n(A\cap B\cap C)+n(B\cap A)$ $n(B)=10+2+5+3=20$
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