Answer
61
Work Step by Step
We know that the number of items in A or B is equal to the number of items in A plus the number of items in B minus the number of items in A and B. Thus, it follows:
$$ = 47+ 31 - 17 \\ = 61$$
Elementary Geometry for College Students (7th Edition)
by Alexander, Daniel C.; Koeberlein, Geralyn M.
Published by
Cengage
ISBN 10:
978-1-337-61408-5
ISBN 13:
978-1-33761-408-5
Chapter P - Preliminary Concepts - Chapter P Test - Page 30: 4
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