Answer
$\ln{4}$
Work Step by Step
Recall:
(1) $n\cdot \ln{a}=\ln{a^n}$
(2) $\ln{a}+\ln{b}=\ln{(ab)}$
(3) $\ln{a}-\ln{b} = \ln{\left(\frac{a}{b}\right)}$
Use rule (3) above to obtain:
\begin{align*}
\ln{24}-\ln{6}&=\ln{\left(\frac{24}{6}\right)}\\
&=\ln{4}
\end{align*}