stirling’s approximation
The factorial of a non-negative integer \(n\), denoted by \(n!\), is the product of all positive integers from 1 to \(n\).
\[ n! = \prod_{k=1}^{n} k \]
The factorial of a non-negative integer \(n\), denoted by \(n!\), is the product of all positive integers from 1 to \(n\).
\[ n! = \prod_{k=1}^{n} k \]