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Evaluate $1+2x+3x^2+4x^3+\dots$ upto infinity, where $|x|<1$.

  1. $\frac{1}{(1-x)^2}$
  2. $\frac{x}{(1-x)^2}$
  3. $\frac{x^2}{(1-x)^2}$
  4. $1-\frac{1}{(1-x)^2}$
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