Answer
$\displaystyle\sum_{i=1}^{6}5(2)^{i-1}$
Work Step by Step
Using the summation notation, the series $
5+10+20+40+80+160
$ is equivalent to
\begin{array}{l}
\displaystyle\sum_{i=1}^{6}5(2)^{i-1}
.\end{array}
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