Solve the Problem $$2,1 , \frac { 1 } { 2 } , \frac { 1 } { 4 } , \ldots , \text { find } a _ { n }$$

Solve the problem.
-For the geometric sequence 2, 1, $$2,1 , \frac { 1 } { 2 } , \frac { 1 } { 4 } , \ldots , \text { find } a _ { n }$$ . A) $a _ { n } = 2 ^ { 1 - n }$
B) $a _ { n } = \left( \frac { 1 } { 2 } \right) ^ { 1 - n }$
C) $a _ { n } = 2 ^ { n - 2 }$
D) $a _ { n } = \left( \frac { 1 } { 2 } \right) ^ { n - 2 }$

Correct Answer:

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