Answer
5
Work Step by Step
In order to count all of the elements that are in A and B and C, we have to add up the numbers that are in the intersection of the three sets. This means: $ n(A\cap B\cap C)=5$
College Algebra (10th Edition)
by Sullivan, Michael
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: 21
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