જો શ્રેણી $\log _{7^{1/2}} x + \log _{7^{1/3}} x + \log _{7^{1/4}} x + \dots$ ના પ્રથમ $20$ પદોનો સરવાળો $460$ હોય,તો $x$ ની કિંમત શોધો:

  • A
    $7^{46/21}$
  • B
    $7^{1/2}$
  • C
    $e^{2}$
  • D
    $49$

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