Algebra 1

Published by Prentice Hall
ISBN 10: 0133500403
ISBN 13: 978-0-13350-040-0

Chapter 12 - Data Analysis and Probability - 12-7 Thoretical and Experimental Probability - Mixed Review - Page 762: 50



Work Step by Step

Use the formula of permutation: $_{n}$P$_{r}$=$\frac{n!}{(n-r)!}$. Plug in 7 for N and 4 for R: $_{n}$P$_{r}$=$\frac{n!}{(n-r)!}$ $_{7}$P$_{4}$=$\frac{7!}{(7-4)!}$ -simplify- $_{7}$P$_{4}$=$\frac{7!}{3!}$ -write using factorial- $_{7}$P$_{4}$=$\frac{7*6*5*4*3*2*1}{3*2*1}$ -simplify- $_{7}$P$_{4}$=840
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