[" Question No."21],[" In an A.P.,if common difference is "2," sum of "n" terms is "49,7" th term is "13," the "]

In an A.P.if common difference is 2, sum to n terms is 49,7 th term is 13, then n=

In an A.P., if common difference is 2, sum to n terms is 49, 7th term is 13, then n =

In an A.P., if common difference is 2, sum to n terms is 49, 7th term is 13, then n=

In an AP ,if common difference is 2 ,sum to n terms is 49 , 7th term is 13 ,then n=

Find the common difference if n^(th) term of AP is 7-4n.

If the sum of n terms of an A.P. be 3n^2-n and its common difference is 6, then its first term is

If n^(th) term of A.P is 2n+3, then common difference is

The sum of n terms of an A.P. is 136, the common difference is 4 and the last term is 31, find the number of terms.

Solve the following questions. (i) Check whether the sequence -3, -1,1,3 ,…. Is an A.P. If it is an A.P., find the common difference. (ii) If the 7th term of an A.P. is 40, then find S_(13) .

Solve the following questions. (i) Check whether the sequence -3, -1,1,3 ,…. Is an A.P. If it is an A.P., find the common difference. (ii) If the 7th term of an A.P. is 40, then find S_(13) .