Answer
$45$
Work Step by Step
Not in $B$ (denoted by $\overline{B}$) means the ones that are outisde of $B$.
Using the given diagram gives:
$n( \overline{B})=20+1+4+20=45$
Precalculus: Concepts Through Functions, A Unit Circle Approach to Trigonometry (3rd Edition)
by Sullivan III, Michael
Published by
Pearson
ISBN 10:
0-32193-104-1
ISBN 13:
978-0-32193-104-7
Chapter 12 - Counting and Probability - Chapter Review - Review Exercises - Page 888: 7
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