WBJEE 2012 Math Solved Paper

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Question : 78 of 80

Marks: +1, -0

Let Sk be the sum of an infinite GP series whose first term is k and common ratio is

k

k+1

(k>0), Then, the value of

∞

∑

k=1

‌

(−1)k

Sk

is equal to

loge4
loge2−1
1−loge2
1−loge4

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