Question

What expression can be used to find the number of permutations of n distinct objects taken r at a time?

Answer 1

\(nPr = \frac{n!}{(n-r)!}\)

Answer 2

I'm almost certian that you could of found this in your book.

Answer 3

I thought that was the answer I just like to double check myself as it's an advantage in my studies - thank you.