#### Answer

$1364$

#### Work Step by Step

$r=\dfrac {256}{64}=\dfrac {64}{16}=\dfrac {16}{4}=4;a_{1}=4\Rightarrow S_{n}=\dfrac {a_{1}\left( r^{n}-1\right) }{r-1}=\dfrac {4\times \left( 4^{5}-1\right) }{4-1}=1364$

Published by
Pearson

ISBN 10:
013421742X

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

$1364$

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