Find a Formula for the General Term $a _ { n }$

question 189

Multiple Choice

Find a formula for the general term $a _ { n }$ of the sequence $\left\{ 1 , - \frac { 1 } { 2 } , \frac { 1 } { 4 } , - \frac { 1 } { 8 } , \ldots \right\}$ .

• A) \(2 ^ { 1 - n }\)
• B) \(2 ^ { n - 1 }\)
• C) \(( - 2 ) ^ { n }\)
• D) \(( - 2 ) ^ { n - 1 }\)
• E) \(( - 1 ) ^ { 2 n }\)
• F) \(( - 2 ) ^ { 1 - n }\)
• G) \(( - 2 ) ^ { 2 n }\)
• H) \(2 ^ { - n }\)

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