$\mathop {\lim }\limits_{x \to 7} \frac{{2 - \sqrt {x - 3} }}{{{x^2} - 49}}$ का मान है

  • A
    $\frac{2}{9}$
  • B
    $-\frac{2}{49}$
  • C
    $\frac{1}{56}$
  • D
    $-\frac{1}{56}$

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