Write the Expression for the General (Or Nth)termrm $\mathbf { a } _ { \mathbf { n } } ,$

question 78

Multiple Choice

Write the expression for the general (or nth) termrm, $\mathbf { a } _ { \mathbf { n } } ,$ , of the geometric sequence.
- $2,1 , \frac { 1 } { 2 } , \frac { 1 } { 4 } , \ldots$

• A) \(a _ { n } = \frac { 1 } { 2 } ( 2 ) ^ { n - 1 }\)
• B) \(a _ { n } = 2 \left( \frac { 1 } { 2 } \right) ^ { n - 1 }\)
• C) \(a _ { n } = 2 ( 2 ) ^ { n - 1 }\)
• D) \(a _ { n } = 2 \left( \frac { 1 } { 4 } \right) ^ { n - 1 }\)

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