Write a Formula for the General Term (The Nth Term) $$\frac { 1 } { 9 } , - \frac { 1 } { 18 } , \frac { 1 } { 36 } , - \frac { 1 } { 72 } , \ldots$$

question 161

Multiple Choice

Write a formula for the general term (the nth term) of the geometric sequence.
- $$\frac { 1 } { 9 } , - \frac { 1 } { 18 } , \frac { 1 } { 36 } , - \frac { 1 } { 72 } , \ldots$$

• A) \(a _ { n } = \frac { 1 } { 9 } \left( - \frac { 1 } { 2 } \right) ^ { n - 1 }\)
• B) \(a _ { n } = \frac { 1 } { 9 } - \frac { 1 } { 2 } ( n - 1 )\)
• C) \(a _ { n } = \frac { 1 } { 2 } \left( - \frac { 1 } { 9 } \right) ^ { n - 1 }\)
• D) \(a _ { n } = \left( \frac { 1 } { 9 } \right) ^ { n - 1 } - \frac { 1 } { 6 }\)

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