Discrete Mathematics with Applications 4th Edition

Published by Cengage Learning
ISBN 10: 0-49539-132-8
ISBN 13: 978-0-49539-132-6

Chapter 9 - Counting and Probability - Exercise Set 9.2 - Page 536: 8

Answer

12

Work Step by Step

Since the person is buying a unit AND a keyboard AND a printer, we use the multiplication rule: there are 3(2)(2) = 12 distinct systems.
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