The irrationality of e

This is the post excerpt.

The irrationality of e can be proved using the infinite series expansion.

e=\sum_{k=0}^{\infty} \frac{1}{k!}

Assume that e is rational.i.e e=\frac{p}{q} where p \in \mathbb{Z} and q \in \mathbb{Z}-{0}.

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