Answer
$45$
Work Step by Step
This should be the union of physics and chemistry, thus the number is $9+15+7+8+2+4=45$
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 Test - Page 889: 4
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