[" 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=

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 .

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

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

Write the common difference of an A.P. the sum of whose first \ \ n terms is P/2n^2+Q n