$\"\"$

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The infinite geometric series is $\"\"$ .

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Where $\"\"$ , $\"\"$ .

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Find the value of $\"\"$ :

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$\"\"$

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$\"\"$

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Find the value of $\"\"$ :

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$\"\"$

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Find the value of $\"\"$ :

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$\"\"$

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$\"\"$

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The first three terms of the sequence are $\"\"$ .