The factorial of a non-integer or negative number is not defined in the traditional sense, but it can be computed using the Gamma function.
The Gamma function is a continuous extension of the factorial function for real and complex numbers. For a number x, the factorial is defined as: x! = Γ(x+1) To find the factorial of -1/2, we use: (-1/2)! = Γ(1/2) We know that Γ(1/2) = √π.
Therefore, the factorial of -1/2 is √π.


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