Write a Formula for the General Term (The Nth Term) $3,1 , \frac { 1 } { 3 } , \frac { 1 } { 9 } , \frac { 1 } { 27 } , \ldots$

Multiple Choice

Write a formula for the general term (the nth term) of the geometric sequence.
- $3,1 , \frac { 1 } { 3 } , \frac { 1 } { 9 } , \frac { 1 } { 27 } , \ldots$

A) $a _ { n } = 3 \left( \frac { 1 } { 9 } \right) ^ { n - 1 }$
B) $a _ { n } = 3 \left( \frac { 1 } { 3 } \right) ^ { n }$
C) $\mathrm { a } _ { \mathrm { n } } = 3 \left( \frac { 1 } { 3 } \right) ^ { \mathrm { n } - 1 }$
D) $a _ { n } = 3 \left( \frac { 1 } { 3 } \right) ^ { n + 1 }$