Answer
$242$
Work Step by Step
$\sum_{i=1}^{5} 2(3^{i-1})=2 \times [\dfrac{3^6-1}{3-1}]$
$=2 \times [\dfrac{3^5-1}{3-1}]$
$=2 \times [\dfrac{243-1}{3-1}]$
$=2 \times [\dfrac{242}{2}]$
$=242$
You can help us out by revising, improving and updating this answer.
Update this answerAfter you claim an answer you’ll have 24 hours to send in a draft. An editor will review the submission and either publish your submission or provide feedback.