In an AP:
(v) Given `a = 2, d = 8, S_(n) = 90`, find n and `a_(n)`.

In an AP: (i) Given a = 5, d = 3, a_(n) = 50 , find n and S_(n) .

In an AP: (vi) Given a_(n) = 4, d = 2, S_(n) = -14 , find n and a.

In an AP: (i) Given a=5, d=3, a_(n) = 50 , find n and S_(n) (ii) given a=7, a_(13) = 35 , find d and S_(13) . (iii) given a_(12) = 37, d=3 , find a and S_(12) (iv) given a_(3) = 15, S_(10) = 125 , find d and a_(10) (v) given a=2, d= 8, S_(n) = 90 , find n and a_(n) (vi) given a_(n) = 4, d=2, S_(n) = - 14 , find n and a. (vii) given l=28, S= 144, and there are total 9 terms, find a.

In an AP: (iv) Given a_(3) = 15, S_(10) = 125 , find d and a_(10) .

In an AP: (ii) Given a = 7, a_(13) = 35 , find d and S_(13) .

In an AP: (iii) Given a_(12) = 37, d = 3 , find a and S_(12) .

If a= 4, d= 3, S_n=69 . Then find 'n' and a_n .

If a=3, d = 5, S_n=1010 . Then find 'n' and a_n .

In an A.P., if a = 1 , a_(n) = 20 and S_(n) = 399 , then n = ……..

a_(n) = n/(n+2) , a_(3) = ……….