यदि $y=2 x^{n+1}+\frac{3}{x^{n}}$ है,तो $x^{2} \frac{d^{2} y}{d x^{2}}$ का मान क्या है?

  • A
    $6 n(n+1) y$
  • B
    $n(n+1) y$
  • C
    $x \frac{d y}{d x}+y$
  • D
    $y$

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