Answer
15 students
Work Step by Step
To find the number of students in both sets, we subtract 100 (the number interviewed) from the number of students in either of the sets. Doing this, we find:
$$ =68+47-100 \\ = 115-100 \\ =15 \ students $$
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 - P.1 - Sets and Geometry - Exercises P.1 - Page 7: 36
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