This have been asked before but I think people misunderstood my question.
For a better notation:
$e-\sum_{k=0}^{n}1/k! = e - \sum^n$ .
Having the following inequality:
$0 < n!(e-\sum^n) <1/n \tag{1}$
we can apply the squeeze theorem to show that $n!(e-\sum^n)$ goes to zero as $n$ goes to infinity.
If $n!(e-\sum^n)$ goes to zero when $n \to \infty$ this means that $\sum^n$ converges so quickly to $e$ that $(e-\sum^n)$ goes to $0$ faster than $n!$ goes to infinity as $n \to \infty$.
Is possible to show this without relying on $(1)\:?$
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