As $n \to \infty$, $\frac{a_n}{3^n} \to 0$

As $n \to \infty$, $\frac{a_n}{3^n} \to 4$

As $n \to \infty$, $\frac{a_n}{2^n} \to 4$

Both the $3^n$ and $2^n$ terms grow at the same rate