If $y=ax^{n+1}+b x^{-n}$,then $x^2 \frac{d^2 y}{d x^2}=$

  • A
    $n(n+1) y$
  • B
    $(n+1)(n-2) y$
  • C
    $n(n-2) y$
  • D
    $(n+1) y$

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