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Find the convergence of the series $\sum \frac{n^{n-2}}{e^n n!}$

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Show that the series $\sum_{n=1}^{\infty} \frac{n^{n-2}}{e^n n!}$ is convergent.I tried to use root test but it yields 1 which makes the test indecisive . Any other approach ?


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