$\lim _{x \rightarrow 1} \left( \frac{x+x^2+x^3+\ldots+x^n-n}{x-1} \right) = $

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

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