Let a(1), a(2), a(3), … be a G. P. such ...

Let `a_(1), a_(2), a_(3)`, … be a G. P. such that `a_(1)lt0`, `a_(1)+a_(2)=4` and `a_(3)+a_(4)=16`. If `sum_(i=1)^(9) a_(i) = 4lambda`, then `lambda` is equal to :

A

`(511)/(3)`

B

171

C

`-513`

D

`-171`

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The correct Answer is:

`D`

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