## Geometry: Common Core (15th Edition)

Published by Prentice Hall

# Chapter 13 - Probability - Mid-Chapter Quiz - Page 843: 13

56

#### Work Step by Step

We know that: $_nC_r =\frac{_nP_r}{r!} = \frac{n!}{(n-r)!r!}$ $_8C_5 = \frac{8!}{(8-5)!5!}$ $\frac{ 8!}{3!5!}$ We also know that: $x! = x(x-1)(x-2)...(1)$ Thus, we have: 56

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