We know that
$0<\dfrac{2^n}{3^n(n+7)} < \left(\dfrac{2}{3}\right)^n$
for any $n\ge 1$.
**Considering this fact, what does the direct comparison test say about $\displaystyle\sum\limits_{n=1}^{\infty }\dfrac{2^n}{3^n(n+7)}$ ?**
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