Let a_1, a_2,......,a_ 21 be an AP such that _ n=1 ^ 20 1 a_na_ n+1 = 4 9 . If the sum of this AP is 189,...

Question

Let a_1, a_2,......,a_ 21 be an AP such that _ n=1 ^ 20 1 a_na_ n+1 = 4 9 . If the sum of this AP is 189, then a_6a_ 16 is equal to :

Accepted Answer

(B)

JEE Main 2021 Mathematics question