Discrete Mathematics with Applications 4th Edition

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: 42

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.”
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