Answer
If this number is not divisible by 3, then it is not divisible
by 9.
If this number is divisible by 9, then it is divisible by 3.
Work Step by Step
r is a necessary condition for s means “if not r then not s.”
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 2 - The Logic of Compound Statements - Exercise Set 2.2 - Page 50: 42
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