## sdk Group Title Type the formula for the number of permutations of n things taken r at a time. p(n,r)= 2 years ago 2 years ago

1. johhjohn

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

2. FoolForMath

$\frac {n!}{(n-r)!}$

3. ParthKohli

$$\color{Black}{\Rightarrow P(n,r) = \Large {n! \over (n - r)!} }$$ lol had to give the answer out here.

4. ParthKohli

Forgive me, Mr. Fool