\"\"

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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 4th term \"\".