Answer
$25$
Work Step by Step
Neither $A$ nor $C$ (denoted by $\overline{A} \cup \overline{C}$) refers to the regions outside of both $A$ and $C$.
Using the given diagram gives:
$n( \overline{A}\cup\overline{C})=5+20=25$
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: 8
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