Original post by ElectronDonor
How do you write this in terms of factorials n(n-1)(n-2)
n!
----
(n-3)!
see it as n! = n(n-1)(n-2)(n-3)(n-4)....(1), but you want to get rid of the (n-3)(n-4)....(1)
So get n! and divide it by (n-3)!
Hope this helps
Thanks that was very useful
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