Answer
$n(U)-n(B)=4$
Work Step by Step
We can count that $n(U)=8$ and $n(B)=4$, therefore:
$n(U)-n(B)=4$
Thinking Mathematically (6th Edition)
by Blitzer, Robert F.
Published by
Pearson
ISBN 10:
0321867327
ISBN 13:
978-0-32186-732-2
Chapter 2 - Set Theory - 2.3 Venn Diagrams and Set Operations - Exercise Set 2.3 - Page 81: 91
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