Answer
$24$
Work Step by Step
RECALL:
$n(A∪B) = n(A) + n(B) - n(A∩B)$
Thus,
$ n(B)= n(A∪B)-n(A)+ n(A∩B)\\
n(B)= 30-12+6 = 24$
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: 3
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