#### Answer

$682$

#### Work Step by Step

$r=\dfrac {128}{32}=\dfrac {32}{8}=\dfrac {8}{2}=4;a_{1}=2\Rightarrow S_{n}=\dfrac {a_{1}\left( r^{n}-1\right) }{r-1}=\dfrac {2\times \left( 4^{5}-1\right) }{4-1}=682$

Published by
Pearson

ISBN 10:
013421742X

ISBN 13:
978-0-13421-742-0

$682$

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