Metallurgical Engineering > GATE 2020 > Sequence and Series

Contributed by: Dr. Sarah Chen

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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

Check Answer

Explanation

Correct : d

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