Linear Algebra: A Modern Introduction

Published by Cengage Learning
ISBN 10: 1285463242
ISBN 13: 978-1-28546-324-7

Chapter 3 - Matrices - 3.7 Applications - Exercises 3.7 - Page 247: 20


Not an exchange matrix.

Work Step by Step

A matrix is an exchange matrix if the sum of each column is $1$. Here the sum of the first column is $\frac{1}{3}+\frac{1}{2}=\frac{5}{6}\ne1$, thus the matrix is not an exchange matrix.
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