Answer
$9$
Work Step by Step
Factor each number to get:
$27=3\times3\times3$
$72=3\times3\times2\times2\times2$
Thus we can find gcd=$3\times3=9$
Discrete Mathematics with Applications 4th Edition
by Epp, Susanna S.
Published by
Cengage Learning
ISBN 10:
0-49539-132-8
ISBN 13:
978-0-49539-132-6
Chapter 4 - Elementary Number Theory and Methods of Proof - Exercise Set 4.8 - Page 225: 9
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