यदि $a > 0$ और $\lim _{x \rightarrow a} \frac{a^x - x^a}{x^x - a^a} = -1$ है,तो $a$ का मान ज्ञात कीजिए।

  • A
    $0$
  • B
    $1$
  • C
    $e$
  • D
    $2e$

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