## Algebra 1: Common Core (15th Edition)

Published by Prentice Hall

# Chapter 12 - Data Analysis and Probability - 12-7 Theoretical and Experimental Probability - Practice and Problem-Solving Exercises - Page 774: 50

840

#### Work Step by Step

We know that: $_nP_r = \frac{n!}{(n-r)!}$ $_7P_4 = \frac{7!}{(7-4)!}$ $\frac{7!}{3!}$ We also know that: $x! = x(x-1)(x-2)...(1)$ Thus, we have: 840

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