Mastering the Calculator using the Sharp EL-531LH
21
8.
Factorial
n
!
Look at your calculator and find the key with the symbol n! on it. You will come across this
symbol when doing the Binomial Distribution. This is called the factorial key.
Use it to find the 3! and 5!. Press
3! means 3
×
2
×
1
3! = 6
and 5! = 5
×
4
×
3
×
2
×
1
5! = 120
How many ways would you guess that we could arrange ten people?
That is, how large would you estimate 10! to be? Use your calculator to find 10!
You should get 3 628 800.
10! = 10
×
9
×
8
×
...
×
3
×
2
×
1
(Thank goodness this can be done on the calculator.)
Use
to activate n!
