Answer
The statement is not a good definition because it is not reversible.
Work Step by Step
The reverse is:
A writing instrument is a pen.
A pencil is also a writing instrument, yet it is not a pen, so this is false.
Geometry: Common Core (15th Edition)
by Charles, Randall I.
Published by
Prentice Hall
ISBN 10:
0133281159
ISBN 13:
978-0-13328-115-6
Chapter 2 - Reasoning and Proof - Chapter Test - Page 133: 9
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