#### Answer

$n=11$

#### Work Step by Step

$a_n=2(3)^n-24$ when $a_n=354270$
$2(3)^n-24=354270$
$\implies 2(3)^n=354294$
$\implies (3)^n=177147$
$\implies n=\log_3{177147}=11$

Published by
Brooks Cole

ISBN 10:
0-53449-636-9

ISBN 13:
978-0-53449-636-4

$n=11$

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