Thinking Mathematically (6th Edition)

Published by Pearson
ISBN 10: 0321867327
ISBN 13: 978-0-32186-732-2

Chapter 11 - Counting Methods and Probability Theory - 11.3 Combinations - Exercise Set 11.3: 49

Answer

2730 cones

Work Step by Step

Order of the chosen flavors matters. Permutations, ${}_{n}P_{r}=\displaystyle \frac{n!}{(n-r)!}$. ${}_{15}P_{3}=\displaystyle \frac{15!}{(15-3)!}=15\times 14\times 13$ $=2730$
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