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Cardiff Maths Student
 
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Default How do I use the Gamma Function in Excel

Hi!
I'm trying to use a formula that contains the Gamma function in Excel
but this does not seem to be under the list of functions. If I type its
definition:
Gamma(n)=(n-1)! it gives an error message when n-1 is not
an integer.
Has anyone got any ideas how I can get past this?
Thanks