Metallurgical Engineering > GATE 2020 > Sequence and Series
The sum of the first n terms in the sequence 8, 88, 888, 8888,... is __________.
A
(81 / 80)(10n - 1) + (9 / 8)n
B
(81 / 80)(10n - 1) - (9 / 8)n
C
(80 / 81)(10n - 1) + (8 / 9)n
D
(80 / 81)(10n - 1) - (8 / 9)n

Correct : d

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