Algebra and Trigonometry 10th Edition

Published by Cengage Learning
ISBN 10: 9781337271172
ISBN 13: 978-1-33727-117-2

Chapter 11 - 11.6 - Counting Principles - 11.6 Exercises - Page 823: 5



Work Step by Step

Order is not important means that if the order in which each of the $r$ elements are selected is changed, the final result will be the same. It is like receiving a 50 dollar bill plus a 10 dollar bill. The order is not important. The final result is that you have received 60 dollars.
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