Of the three numbers, the first is twice the second and the second is twice the third. The average of the reciprocal of the numbers is $\frac{7}{72} .$ The numbers are

  • A

    $16,\,8,\,4$

  • B

    $20,\,10,\,5$

  • C

    $24,\,12,\,6$

  • D

    $36,\,18,\,9$

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