Answer
$3$
Work Step by Step
Recall:
$\log_a{\left(a^n\right)}=n$
Using the rule above, and knowing the natural logarithms has base $e$, gives:
\begin{align*}
\ln{\left(e^3\right)}&=\log_e{\left(e^3\right)}\\
&=3
\end{align*}
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