# Dealing with factorials

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#1
How do you sort out things with ! signs?

like the thing attached.. what are the rules for dealing with tehse things?
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15 years ago
#2
(Original post by kikzen)
How do you sort out things with ! signs?

like the thing attached.. what are the rules for dealing with tehse things?
x! = x.(x-1).(x-2)....3.2.1

(x+1)! = (x+1).x.(x-1).(x-2).....3.2.1 = x!.(x+1)

Can you finish from there?
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#3
(Original post by It'sPhil...)
x! = x.(x-1).(x-2)....3.2.1

(x+1)! = (x+1).x.(x-1).(x-2).....3.2.1 = x!.(x+1)

Can you finish from there?
ingenious, are there any other things like this, or is it all similar ?

yeah i can finish off..
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