Let `a_1, a_2, a_3, ....a_n,.........`be in A.P. If `a_3 + a_7 + a_11 + a_15 = 72,` then the

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Q) Let 𝑎_1,𝑎_2,𝑎_3,….be an A.P. If ∑_(𝑟=1)^∞ 𝑎_𝑟/2^𝑟 =4, then 4a_2 is equal to ____ #jee #maths

Let a_1,a_2,a_3,… be a G.P. of increasing positive numbers. If a_3 a_5=729 and a_2+a_4=111/4, then

Let `a_1, a_2, a_3, ,a_(100)` be an arithmetic progression with `a_1=3a n ds_p=sum_(i=1)^p a_i...

If a_1,a_2,a_3,…a_n are in A.P. and a_1+a_4+a_7+⋯+a_16=114 then a_1+a_6+a_11+a_16 is equal to

For the A.P., a_1, a_2, a_3, ……, if a_4: a_7=2: 3, find a_6: a_8.

Let the sequence`a_1,a_2....a_n` form and AP. Then `a_1^1-a_2^2+a_3^2-a_4^2...` is equal to

Q) Let 𝑎_1,𝑎_2,𝑎_3…. be in an A.P. such that ∑129_(𝑘=1)^12  𝑎_(2𝑘−1)=−72/5 𝑎_1,𝑎_1≠0 If ∑129_(𝑘=1)^

If `a_1, a_2, a_3, .... a_4001` are terms of an A.P. such that `1/(a_1a_2)+1/(a_2a_3)+1/(a_3a_