यदि $y = [(x+1)(2x+1)(3x+1) \ldots (nx+1)]^4$ है,तो $x=0$ पर $\frac{dy}{dx}$ का मान ज्ञात कीजिए।

  • A
    $\frac{n(n+1)}{2}$
  • B
    $4n(n+1)$
  • C
    $\left(\frac{n(n+1)}{2}\right)^2$
  • D
    $2n(n+1)$

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