# Chapter 9 - Conic Sections, Sequences, and Series - 9.4 Geometric Sequences - 9.4 Exercises - Page 737: 17

Not geometric

#### Work Step by Step

$-4.5, 0, 4.5, 9, 13.5, 18, . . .$ Observe that $\frac{a_3}{a_2}=\frac{4.5}{0}$, which is undefined and so the sequence cannot be geometric.

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