$\"\"$

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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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Apply alternate geometric series formula $\"\"$ .

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$\"\"$ (Substitute $\"\"$ ) $\"\"$

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

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

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

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

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The value of $\"\"$ .