$\"\"$

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The sequence 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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Formula for the sum of finite geometric series: $\"\"$ .

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Here $\"\"$ .

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$\"\"$

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$\"\"$

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Sum of the first eight terms is $\"\"$ .

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$\"\"$

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Sum of the first eight terms is $\"\"$ .