Algebra and Trigonometry 10th Edition

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

Chapter 11 - Chapter Test - Page 843: 14


(a) $_9P_2=72$ (b) $_{70}P_3=328,440$

Work Step by Step

(a) $_9P_2=\frac{9!}{(9-2)!}=\frac{9\times8\times7!}{7!}=72$ (b) $_{70}P_3=\frac{70!}{(70-3)!}=\frac{70\times69\times68\times67!}{67!}=328,440$
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