Answer
Multiplying $a$ and $b$, we get 30, which is $2$ mod 7, so this is true.
Work Step by Step
We use the multiplicative property of modular arithmetic.
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 4.4 - Page 189: 25
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