Answer
The proof uses one specific instance of rational numbers being added together to yield another rational number, but does not prove the result for all rational number pairs.
Work Step by Step
It is invalid.
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 4.2 - Page 169: 36
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