The sum of an infinite geometric series with positive terms is $3$ and the sum of the cubes of its terms is $\frac {27}{19}$. Then the common ratio of this series is

  • [JEE MAIN 2019]
  • A

    $\frac {1}{3}$

  • B

    $\frac {2}{3}$

  • C

    $\frac {2}{9}$

  • D

    $\frac {4}{9}$

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Find the sum of the following series up to n terms:

$6+.66+.666+\ldots$