જો $\mathop {\lim }\limits_{x \to a} \frac{{{a^x} - {x^a}}}{{{x^x} - {a^a}}} = - 1$ હોય,તો

  • A
    $a = 1$
  • B
    $a = 0$
  • C
    $a = e$
  • D
    આમાંથી કોઈ નહીં

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