factorial n

If you have a statistical equation involving n! but in some
circumstances n is non integre can you enter
some "average" value for n.
eg if n=6.25 can you put in some value between
6! and 7! and if so what sort of average?
the average of 6! and (6! + 7!)/2 ?
eg for 6.25, n!= 0.75*6! + 0.25 * 7!
or some other value ?


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