यदि $x^{2} y^{5}=(x+y)^{7}$ है,तो $\frac{d^{2} y}{d x^{2}}$ का मान ज्ञात कीजिए।

  • A
    $y / x^{2}$
  • B
    $x / y$
  • C
    $1$
  • D
    $0$

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