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

Let `a_(1),a_(2),a_(3),...` be a G `P` such that `a_(1)lt 0,a_(1)+a_(2)=4` and `a_(3)+a_(4)=16.` If `sum_(i=1)^(9)a_(i)=4 lambda`, then `lambda` is equal to "

A

171

B

`511//3`

C

`-171`

D

`-513`

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The correct Answer is:

D

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