UPSC NDA I 2017 Mathematics Solved Paper

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Question : 7 of 120

Marks: +1, -0

The sum of the first n terms of the series ‌‌

1

2

+‌‌

3

4

+‌‌

7

8

+‌‌

15

16

+... is equal to

[NDA I 2017]

2n−n−1
1−2−n
2−n+n−1
2n−1

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