જો $\log _{30} 3=a$ અને $\log _{30} 5=b$ હોય,તો $\log _{30} 8$ ની કિંમત શોધો.

  • A
    $3(1-a-b)$
  • B
    $a-b+1$
  • C
    $1-a-b$
  • D
    $3(a-b+1)$

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