Answer
$24$
Work Step by Step
According to the counting formula we know that $n(A\cup B)=n(A)+n(B)-n(A\cap B).$
Hence here $30=12+n(B)-6\\n(B)=30-12+6=24.$
Precalculus (10th Edition)
by Sullivan, Michael
Published by
Pearson
ISBN 10:
0-32197-907-9
ISBN 13:
978-0-32197-907-0
Chapter 13 - Counting and Probability - Chapter Review - Review Exercises - Page 868: 3
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