defence exam Coast Guard Navik GD (General Duty) 02/2025 Mock Test Series Mathematics Sequences and Series Geometric Progressions
मान लीजिए a1, a2, a3, … एक G.P. है ऐसा कि a1 < 0, a1 + a2 = 4 और a3 + a4 = 16. यदि \(\sum_{i=1}^9 a_i=4 \lambda\) तो λ बराबर है :
1
171
2
511/3
3
-171
4
-513