The first term of an A.P. is 2 and the nth term is 29 . If `S_(n) = 465`, then what is the value of n ?

The first term of an A.P. is 1 and nth term is 25 If S_(n)=520 , then n = ….

Choose the correct alternative answer: The first term of an A.P. is 1 and nth term is 20 . If S_n=399 , then n=?

Choose the correct alternative: The first term of an A.P. is 1 and nth term is 25 . If S_n=520 , then n=….

The first term of an A.P. is 2 and the nth term is 41. What is the value of n, if S_(n) = 860 ?

The sum of first n terms of an A.P. is 5n^(2) + 3n . If the nth term is 168, find the value of n. Also find the 20th term of the A.P.

If the mth term of an A.P is n and nth term is m , then pth term =

The mth term of an A.P. is n and nth term is m. Then rth term of it is

The nth term of an A.P. is (1)/(n) and nth term is (1)/(m). Its (mn)th term is :

The sum of first n terms of an A.P.is 5n-n^(2) . Find the nth term of this A.P.

Find the sum of first 25 terms of an A.P. whose nth term is 1- 4n