José is on a gameshow that involves a taste test. He gets to see a list of 15 different secret ingredients before tasting 3 dishes one after the other. The 3 dishes are all identical to each other except that each dish contains 1
of the 15 secret ingredients. He gets 60 seconds to identify what secret ingredient was in each dish.

The permutation formula nPr can be used to find the number of unique ways to arrange the ingredients in the
dishes.

What are the appropriate values of n and r?