Let a_1,a_2,a_3 be a G.P. such that a_1<0, a_1+a_2=4 and a_3+a_4=16. If _ i=1 ^9a_i=4 , then is equal to

JEE Main Mathematics question

Let be a G.P. such that , and . If , then is equal to

Answer: (B)

gives ; would give , so and

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Question ID VK-022112