Thinking Mathematically (6th Edition)

Published by Pearson
ISBN 10: 0321867327
ISBN 13: 978-0-32186-732-2

Chapter 2 - Set Theory - Chapter Summary, Review, and Test - Review Exercises: 46

Answer

n(AUB) = 33

Work Step by Step

In the question it is given that, Set A contains 25 elements i.e. n(A) = 25 Set B contains 17 elements i.e. n(B) = 17 9 elements are common to both the sets i.e. n(A∩B) = 9 Now we need to find n(AUB). n(AUB) = n(A) + n(B) - n(A∩B) = 25 + 17 -9 = 42 - 9 = 33
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