Question

Evaluate $\frac{n!}{(n-r)!}$, when n=6, r=2.

Answer 1

here is answer take the following step( s) into consideration !!!

6! / (6-2)!

=> 6×5× 4× 3×2 / 4!

=> 6×5×4 × 3× 2 / 4× 3× 2



=> 30


hope it help you !!

thanks !!

Answer 2

Answer:

30

Step-by-step explanation:

 we know that factorial of any natural number can be calculated as

n! = n . n-1. n-2...n-(n-1)

So  

here to calculate $\frac{n!}{(n-r)!}$

where n=6,r=2

$\frac{6!}{(6-2)!}\\\\\\=\frac{6.5.4.3.2.1}{4.3.2.1} \\\\\\=6.5\\\\\\=30$