BD-BDMO 2019 Problem 6

When a function $f(x)$ is differentiated $n$ times ,the function we get id denoted $f^n(x)$ .If $f(x)=\dfrac {e^x}{x}$ .Find the value of $$\lim_{n \to \infty} \dfrac {f^ {2n}(1)}{(2n)!}$$