#1**+2 **

Your question makes no sense.

I expect the bracket is supposed to contain 11-8 ?

Melody Oct 31, 2019

#2**+1 **

Agree.

But just trying:

Factorial can be defined as

n!=n×(n−1)×(n−2)...

But what is strange is that if I plug -3! into the calculator,

(-3)! = 1

So.... kind of weird.

Let's just say its somehow 1.

11!/8! =

11 * 10 * 9 =

**990**

CalculatorUser
Oct 31, 2019

#3**+2 **

thanks calc user

\(11C8\\ = \frac{11! }{8!(11-8)!}\\ = \frac{8!*9*10*11 }{8!(3)!}\\ = \frac{9*10*11 }{(3)!}\\ = \frac{9*10*11 }{2*3}\\ = \frac{3*5*11 }{1}\\ =165\)

.Melody Oct 31, 2019

#4**+1 **

yes I think melody's is correct!

What the guest is trying to ask is a combination question.

CalculatorUser
Oct 31, 2019