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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