यदि $y = a{x^{n + 1}} + b{x^{ - n}}$ है,तो ${x^2}\frac{{{d^2}y}}{{d{x^2}}} = $

  • A
    $n(n - 1)y$
  • B
    $n(n + 1)y$
  • C
    $ny$
  • D
    ${n^2}y$

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