\"\"

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The sum of a geometric series is \"\".

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Where \"\" is first term and r is common ratio.

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The given values \"\".

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\"\"               (Substitute \"\")

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\"\"               (Subtract denominator: \"\")\"\"

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\"\"    (Evaluate power: \"\")

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\"\"          (Subtract numerator: \"\")

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\"\"                    (Multiply: \"\")

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\"\"                         (Divide: \"\") \"\"

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The value of \"\".