Shoutbox

letters can be arranged in different orders...

1 letter can b arranged one way round
e.g. = A

2 letters can be arranged two ways round.
e.g. = AB, BA

3 letters can be arranged six ways around.
e.g. = ABC, ACB, BCA, BAC, CBA, CAB

4 letters can be arranged twenty four ways around.
e.g. =  i cant be bothered

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so..   (the the numbers in bold being the amount of letters in the words...)

1=1
2=2x1
3=3x2x1
4=4x3x2x1
5=5x4x3x2x1
6=6x5x4x3x2x1
etc etc...

1=1
2=2
3=6
4=24
5=120
6=720

and so on...

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i understand how it works...

but what i dont undertsand is how i could have this as a formula so i could say

combinations of letter arrangement = .................. (formula)

can anyone shed some light on the subject?

thanks