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Evaluate the following limits:

\(\lim\limits_{x\longrightarrow1}[\frac{x+x^3+x^5...+x^{2n-1}-n}{x-1}] \)

lim [x+x3+x5...+x2n-1-n/x-1] (x ∈ 1)

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\(\lim\limits_{x\longrightarrow1}[\frac{x+x^3+x^5...+x^{2n-1}-n}{x-1}] \)

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