$\lim _{x \rightarrow 1} \frac{x+x^2+\ldots+x^n-n}{x-1}$ का मान है

  • A
    $n$
  • B
    $\frac{n+1}{2}$
  • C
    $\frac{n(n+1)}{2}$
  • D
    $\frac{n(n-1)}{2}$

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