Evaluate the following limits : \[ \operatorname{Lt}_{x \rightarrow 1} \frac{x+x^{2}+x^{3}+\ldot...

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Evaluate the following
limits :
\[
\operatorname{Lt}_{x \rightarrow 1} \frac{x+x^{2}+x^{3}+\ldots+x^{n}-n}{x-1}
\]
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