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Given Are the First Three Terms of a Sequence That $1 , - 3,9$

Question 189

Multiple Choice

Given are the first three terms of a sequence that is geometric. Find a1 and r.
- $1 , - 3,9$

A) $a _ { 1 } = 1 ; r = 3$
B) $a _ { 1 } = 1 ; r = 1$
C) $a _ { 1 } = 1 ; r = - 3$
D) $a _ { 1 } = 1 ; r = - 4$

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