Answer
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Two matrices can not be added or subtracted unless they have the same order $m\times n$. In other words, matrices not having the same order can not be added or subtracted.
Precalculus (6th Edition) Blitzer
by Blitzer, Robert F.
Published by
Pearson
ISBN 10:
0-13446-914-3
ISBN 13:
978-0-13446-914-0
Chapter 8 - Section 8.3 - Matrix Operations and Their Applications - Exercise Set - Page 919: 70
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