#### Answer

Geometric sequence
$r=-3$

#### Work Step by Step

$\dfrac {324}{-108}=\dfrac {-108}{36}=\dfrac {36}{-12}=\dfrac {-12}{4}=-3\Rightarrow r=-3$
Then this is geometric sequence

Published by
Pearson

ISBN 10:
013421742X

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

Geometric sequence
$r=-3$

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