GATE Electrical Engineering (EE) 2011 Solved Paper

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Question : 9 of 65

Marks: +1, -0

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

(4/81) [10ⁿ⁺¹ - 9n - 1]
(4/81) [10n-1 - 9n - 1]
(4/81) [10n+1 - 9n - 10]
(4/81) [10n - 9n - 10]

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