The sum of a geometric series is given by the formula:
$$S_n = \frac{a(1-r^n)}{1-r}$$
where $a$ is the first term, $r$ is the common ratio, and $n$ is the number of terms.
In this case, we have $a=2$, $r=\frac{3}{5}$, and we want to find the sum of the series
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