Given are the first three terms of a sequence that is either arithmetic or geometric. If the sequence is arithmetic, find a1
and d. If a sequence is geometric, find a1 and r.
-$2,6,18 , \ldots$
A) $a _ { 1 } = 2 , r = \frac { 1 } { 3 }$
B) $a _ { 1 } = 2 , r = - 3$
C) $a _ { 1 } = 2 , r = 3$
D) $a _ { 1 } = 2 , d = 3$

Question

Quizplus · Accepted Answer

The sequence is geometric because each term is multiplied by the same factor to get the next term. The first term $a_1 = 2$, and the common ratio $r = \frac{6}{2} = 3$.

Given Are the First Three Terms of a Sequence That 2,6,18,…2,6,18 , \ldots2,6,18,…

Given Are the First Three Terms of a Sequence That $2,6,18 , \ldots$