Discrete Mathematics and Its Applications, Seventh Edition

Published by McGraw-Hill Education
ISBN 10: 0073383090
ISBN 13: 978-0-07338-309-5

Chapter 4 - Section 4.1 - Divisibility and Modular Arithmetic - Exercises - Page 244: 3

Answer

If $a|b$, then $a|bc$ for all integers $c$.

Work Step by Step

Let $a, b$ be integers s.t. $a|b$, where $a$ is nonzero. Now, consider the fixed but arbitrary integer $c$. $bc$ is also an integer. Because $a$ is a multiplicative factor of $b$, it is also a multiplicative factor of $bc$. Thus, the statement is correct.
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