यदि ${x^m}{y^n} = {(x + y)^{m + n}}$ है,तो ${\left. {\frac{dy}{dx}} \right|_{x = 1, y = 2}}$ का मान क्या होगा?

  • A
    $1/2$
  • B
    $2$
  • C
    $2m/n$
  • D
    $m/2n$

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