UPSC NDA I 2015 Mathematics Solved Paper

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Question : 12 of 120

Marks: +1, -0

What is the sum of the series 0.5+0.55+0.555+… to n terms?

[NDA I 2015]

5
9
[n−
2
9
(1−
1
10n
)]
1
9
[5−
2
9
(1−
1
10n
)]
1
9
[n−
5
9
(1−
1
10n
)]
5
9
[n−
1
9
(1−
1
10n
)]

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