Thinking Mathematically (6th Edition)

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

Chapter 2 - Set Theory - 2.5 Survey Problems - Exercise Set 2.5: 2

Answer

The number of elements in Set B = 20.

Work Step by Step

From the given Venn diagram, the regions II and III belongs to the set B. If we add the number of elements in region II and III, we get the number of elements belongs to set B. Therefore the number of elements in Set B = 9 + 11 = 20.
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