Question

Type the formula for the number of permutations of n things taken r at a time.
p(n,r)=

Answer 1

2x^2+4=5-2x^2

Answer 2

\[ \frac {n!}{(n-r)!} \]

Answer 3

\( \color{Black}{\Rightarrow P(n,r) = \Large {n! \over (n - r)!} }\)

lol had to give the answer out here.

Answer 4

Forgive me, Mr. Fool