I've heard of factorials such as $5!$ and $3!$, which work like this: $5!=5\times4\times3\times2\times1=120$ and $3!=3\times2\times1=6$.  At least this is what we get.  Also, surprisingly, $0!=1$, but how can we figure out values for factorials in decimal form such as $(2.5)!$ and $(3.34)!$?  Maybe we should use gamma for part of it?  What else?  I also know that we can draw graphs for factorials.  I just want to know how to find values for factorials in decimal form?
I did not know that you could find an answer for that. However, I can only use Excel so far to do it.  How to calculate 3.6! by hand?
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