यदि $\lim _{x \rightarrow 3} \left( \frac{x^n - 3^n}{x - 3} \right) = 108$ और $n \in N$ है,तो '$n$' का मान ज्ञात कीजिए।

  • A
    $3$
  • B
    $6$
  • C
    $5$
  • D
    $4$

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