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The sum of n terms of the series 4+44+444+……..is

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The sum of n terms of the series 4+44+444+……..is                                                                   

      (a) (4/81) [10n+1 -9n – 1]

      (b) (4/81) [10n-1 -9n – 1]

      (c) (4/81) [10n+1 -9n – 10]

      (d) (481) [10n -9n – 10]

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