$\"\"$

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The sequence is $\"\"$ .

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The first term of the sequence is $\"\"$ .

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The second term of the sequence is $\"\"$ .

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Common ratio is $\"\"$ .

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$\"\"$

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$\"\"$ .

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The third term of the sequence is $\"\"$ .

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Common ratio is $\"\"$ .

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$\"\"$

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$\"\"$ .

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Since the common ration is same, the series is in geometric series.

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$\"\"$

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Sum of the first $\"\"$ terms of the geometric series, $\"\"$ .

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Where $\"\"$ is the first term and $\"\"$ is the common ratio.

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Substitute the values of $\"\"$ and $\"\"$ in $\"\"$ .

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$\"\"$

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$\"\"$

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$\"\"$ .

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$\"\"$

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The sum of the series is $\"\"$ .