Editor
What is the factorial form of n(n-1)(n-2).....(n-r+1)?
Difficulty: Easy
A: 
$\frac{n!}{r!}$
B: 
$\frac{n!}{(n-r)!}$
C: 
$\frac{(n-1)!}{(n-r)!}$
D: 
$\frac{(n+1)!}{(n+r)!}$
Sponsored Ads