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

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) $2 ^ { - n }$

Correct Answer:

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