\"\"

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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 powers: \"\")

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

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

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The value of \"\".