by using the Gamma method apparently...:)
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Not realy besides x! = x*(x-1)!. For some things there are approximations but these are only good for small ranges of values and complicated, generaly reserved for factorials of large numbers.
Whole numbers are a proper subset of decimal numbers. All whole numbers are decimal numbers but not all decimal numbers are whole numbers.
Factorials are a mathematics application used for combinations and permutations. The real world application of factorials are used to find the probability of certain things.
Any amount of numbers can be in a decimal.
All real numbers can be represented in the decimal system. Complex numbers can be represented by a pair of numbers in the decimal system.