$\"\"$

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The given values are $\"\"$ .

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The nth term of a geometric sequence is $\"\"$ ,

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

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

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$\"\"$ (Subtract power: $\"\"$ )

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$\"\"$ (Evaluate power: $\"\"$ )

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

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The value of $\"\"$ .