Let a1,a2...a21 be an AP such that Sigma (n=1 to 20) (1/(an)(an+1).If the sum of this AP is 189

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Let a1,a2 ,......,a21 be an AP such that ∑1/(a_n+1),n∈(1,20) = 4/9 . If the sum of this AP is 189

Let a_1, a_2, …, a_21 be an AP such that sum_(n=1)^20 1/(a_n a_(n+1)) = 4/9. if the sum of this...

Let a1,a2 ,......,a21 be an AP such that 20∑n=11/an an+1 = 49. If the sum of this AP is 189, then a6

Let \(a_1, a_2, \ldots \ldots, a_{21}\) be an AP such that \(\sum_{n=1}^{20} \frac{1}{a_n a_{n+1....

Let a1,a2,a3...be in an A.P. such that Σ a2k-1=-72/5 a1,a≠0.If Σak=0,then n is :

Geometric mean, sequence & series, class11 #geometricmean #sequence #specialseries #class11maths

Let \[{a_1},{a_2},{a_3},........\] be in an A.P. such that \[\sum\limits_{k = 1}^{12} {{a_{2k - 1}}}

Let A1 be the sum of first 2n terms of an AP .Let S2 be the sum of first 4n terms of the same A.P.