Write a Formula for the General Term (The Nth Term) $2,6,18,54,162 , \ldots$

Multiple Choice

Write a formula for the general term (the nth term) of the geometric sequence.
- $2,6,18,54,162 , \ldots$

A) $a _ { n } = 2 ( 3 ) ^ { n - 1 }$
B) $a _ { n } = 2 ( 3 ) ^ { n }$
C) $a _ { n } = a _ { 1 } + 3 ^ { n }$
D) $a _ { n } = 2 ( 3 n )$