यदि $\mathop {\lim }\limits_{x \to a} \frac{{{x^9} + {a^9}}}{{x + a}} = 9$ है,तो $a = $

  • A
    $9^{1/8}$
  • B
    $\pm 2$
  • C
    $\pm 3$
  • D
    इनमें से कोई नहीं

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