What Is 1/2 Factorial

What is the value of 1 by 2 factorial?

Factorials of Numbers 1 to 10 Table

Can you do a fraction factorial?

A first idea that comes to mind to define the factorial of a fractional number is interpolation: knowing the values at two successive integers, the values between these should be intermediate (looking at the “curve”, you see that it is growing – very fast – but smoothly). For instance, you could estimate that 3.1! =3!