જો $\log _{7} 2 = \lambda$ હોય, તો $\log _{49} (28)$ ની કિંમત શોધો.

  • A
    $\frac{1}{2} (2 \lambda + 1)$
  • B
    $\frac{1}{2} (2 \lambda + 2)$
  • C
    $\frac{1}{2} (2 \lambda + 3)$
  • D
    $2 (2 \lambda + 1)$

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