# Chapter 11 - Further Topics in Algebra - Summary Exercises on Sequences and Series - Exercises: 6

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

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