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=

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.

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

In an A.P., if the first term is 22, the common difference is -4 and the sum to n terms is 64, find n .

In an A.P., if the first term is 22, the common difference is -4 and the sum to n terms is 64, find n .

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

If m times the mth term of an A.P. with non-zero common difference equals n times the nth term of the A.P., where m ne n , then (m+n)th term of this A.P. is

Given sum of the first n terms of an A.P. is 2n+3n^(2) Another A.P .is formed with the same first.term and double of the common difference,the sum of n terms of the new A.P. is -

In an A.P. with first term 'a' and common difference 'd' t_(2n) - t_(n) is : (where t_(n) " is the " n^(th) term )

Given sum of the first nterms of an A.P. is 2n+3n^(2) .Another A.P. is formed with the same first term and double of the common difference,the sum of n terms of the new A.P.is: