Teaching DSSSB TGT Mock Test 2025 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 \(\sum\limits_{{\rm{i}}\,{\rm{ = 1}}}^9 {{{\rm{a}}_{\rm{i}}}} \) = 4λ, then λ is equal to

1
-171
2
171
3
\(\frac{511}{3}\)
4
-513
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