Answer
$15120$
Work Step by Step
$_{n}P_k=\frac{n!}{(n-k)!}$
Thus here: $_9P_5=\frac{9!}{(9-5)!}=9\cdot8\cdot7\cdot6=15120$
You can help us out by revising, improving and updating this answer.
Update this answerAfter you claim an answer you’ll have 24 hours to send in a draft. An editor will review the submission and either publish your submission or provide feedback.