જો $y = 1 + x + x^2 + x^3 + . . . + \infty$ અને $|x| < 1$ હોય,તો $y^{\prime \prime} =$

  • A
    $2 y y^{\prime}$
  • B
    $\frac{2 y}{y^{\prime}}$
  • C
    $\frac{y^{\prime}}{2 y}$
  • D
    $2 y^2 y^{\prime}$

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