$\mathop {\lim }\limits_{x \to 1} \frac{{x + {x^2} + ...... + {x^n} - n}}{{x - 1}}$ ની કિંમત શોધો.

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

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