Mathematics Sequences and Series Geometric Progressions

Let a1, a2, a3, … be a G.P. such that a1 < 0, a1 + a2 = 4 and a3 + a4 = 16. If \(\sum_{i=1}^9 a_i=4 \lambda\) then λ is equal to :

1

171

2

511/3

3

-171

4

-513

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