What is the factorial form of n(n-1)(n-2).....(n-r+1)?

Question

Accepted Answer

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

Answer

$\frac{n!}{r!}$

Answer

$\frac{(n-1)!}{(n-r)!}$

Answer

$\frac{(n+1)!}{(n+r)!}$