Find a General Term an for the Geometric Sequence $$a _ { 1 } = - \frac { 1 } { 7 } , r = - 6$$

Find a general term an for the geometric sequence.
- $$a _ { 1 } = - \frac { 1 } { 7 } , r = - 6$$

A) $a _ { n } = - \frac { 1 } { 7 } \cdot ( - 6 ) ^ { n - 1 }$
B) $a _ { n } = \left( - \frac { 1 } { 7 } \right) ^ { n - 1 } + \frac { 1 } { 6 }$
C) $a _ { n } = - \frac { 1 } { 7 } - \frac { 1 } { 6 } ( n - 1 )$
D) $a _ { n } = - \frac { 1 } { 7 } + \frac { 1 } { 6 } ( n - 1 )$

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