$\"\"$

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The geometric series is $\"\"$ .

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Find the common ratio .

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$\"\"$

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$\"\"$

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The common ratio is $\"\"$ .

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Find the sigma notation of the series.

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The sigma notation of geometric series $\"\"$ , where $\"\"$ is upper bound.

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Determine the upper bound by multiplying $\"\"$ to the third term and so on. $\"\"$ .

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$\"\"$ .

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$\"\"$ .

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$\"\"$ .

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Since the geometric series has $\"\"$ terms, the upper bound is $\"\"$ .

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The explicit formula for the sequence is $\"\"$ .

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Substitute $\"\"$ and $\"\"$ .

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$\"\"$ .

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Therefore, the sigma notation of the sequence $\"\"$ is $\"\"$ . $\"\"$

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$\"\"$ .