" Q2.In an "AP" ,if "S_(n)=n(4n+1)" ,then find the "AP" ."

In an AP, If S_(n)=3n^(2)+5n and a_(k)=164, then find the value of k.

In an AP, If S_(n)=3n^(2)+5n and a_(k)=164, then find the value of k.

In an AP, If S_(n)=3n^(2)+5n and a_(k)=164, then find the value of k.

In an A.P., if S_(n) = n(4n + 1), then the value of S_(20) is

In an A.P. if a=2, t_(n)=34 ,S_(n) =90 , then n=

In an A.P. if a=2, t_(n)=34 ,S_(n) =90 , then n=

For an AP, if a_(n)=4, d=2 and S_(n)= -14 , find n and a.

If the sum of n terms of an AP is given by S_(n) = (2n^(2)+3n) then find its common differnece.

If the sum of n terms of an AP is given by S_(n) = (2n^(2)+3n) then find its common differnece.

The sum of the first n terms of an AP is given by S_(n) = 3n^(2) — 4n . Determine the AP and the 12th term.