Answer
$a_n=2\left( \dfrac{1}{5} \right)^n$
Work Step by Step
The terms are the powers of $\dfrac{1}{5}$ multiplied by 2. Hence, a possible general term is
\begin{array}{l}\require{cancel}
a_n=2\left( \dfrac{1}{5} \right)^n
.\end{array}
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