A) $ {{(1+x)}^{-1}}+c $
B) $ {{(1-x)}^{-1}}+c $
C) $ {{(1-x)}^{-1}}-1+c $
D) None of these
Correct Answer: B
$ \int_{{}}^{{}}{(1+2x+3x^{2}+4x^{3}+……),dx} $ $ =\int_{{}}^{{}}{{{(1-x)}^{-2}}dx={{(1-x)}^{-1}}+c.} $
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