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Let b(1),b(2),....... be a geometric seq...

Let `b_(1),b_(2),.......` be a geometric sequence such that `b_(1)+b_(2)=1` and `sum_(k=1)^(oo)b_(k)=2` .Given that `b_(2)<0` ,then the value of `b_(1)` is:

A

`2-sqrt(2)`

B

`1+sqrt(2)`

C

`2+sqrt(2)`

D

`4-sqrt(2)`

Text Solution

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The correct Answer is:
C
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