# WolframAlpha can't calculate this limit.

**Calculus**Level 5

The value of this limit : \[\lim_{n\to + \infty}e^{-n} \sum_{k=0}^n \frac{n^k}{k!} .\] Can be written as \(\frac{a}{b}\), where \(a,b\) are coprime integers.

Find \(a+b\).

The value of this limit : \[\lim_{n\to + \infty}e^{-n} \sum_{k=0}^n \frac{n^k}{k!} .\] Can be written as \(\frac{a}{b}\), where \(a,b\) are coprime integers.

Find \(a+b\).

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