Elementary Geometry for College Students (7th Edition)

Published by Cengage
ISBN 10: 978-1-337-61408-5
ISBN 13: 978-1-33761-408-5

Chapter P - Preliminary Concepts - Chapter P Review Exercises - Page 28: 12

Answer

13

Work Step by Step

We first add the number of values in each of the sets: $$ = 47+35 \\ =82$$ We know that there are 69 values in set A or in set B. We know that the difference between the total number of values in both of the sets and 69 must be the number of values in both sets. Doing this, we find: $$ =82-69 \\ =13$$
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