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11! / 8!(8-11)!

 Oct 30, 2019
 #1
avatar+108629 
+2

Your question makes no sense.

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

 Oct 31, 2019
 #2
avatar+2833 
+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
avatar+108629 
+2

thanks calc user

 

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

.
 Oct 31, 2019
 #4
avatar+2833 
+1

yes I think melody's is correct!
 

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

CalculatorUser  Oct 31, 2019

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