BITSAT 2012 Paper

Section: Mathematics

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Question : 90 of 150

Marks: +1, -0

If x is positive then the sum to infinity of the series

1

1+3x

-

1−3x

(1+3x)2

+

(1−3x)2

(1+3x)3

-

(1−3x)3

(1+3x)4

... ∞ is

1/2
1
6x
1
6x(1+3x)
1
2(1+3x)

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