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Dec 13th, 2017
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  1. 1 + 2/3^2 + 3/3^3 + 4/3^4 + … + k/3^k + …
  2.  
  3. 1/3 + 2/3^2 + 3/3^3 + 4/3^4 + … + k/3^k + …
  4.  
  5. x/((1 - x)^2)
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