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: 14

Answer

The number of elements in set B but not in set A = 9.

Work Step by Step

From the given Venn diagram, the regions III, IV belongs to set B but not set A. It's given from the Venn diagram that, The number of elements belongs to region III = 6 The number of elements belongs to region VI = 3 Therefore the number of elements in set B but not in set A = 6 + 3 = 9.
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