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

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

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