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

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

The sum of the first n terms (n>1) of an AP is 153 and the common difference is 2. If the first term is an integer,then what is the number of possible values of 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 of an AP whose first term is 4, the last term is 49 and the sum of all its terms is 265.

Find the common difference of an AP whose n^(th) term is 6n + 2.

The sum of the first n terms of an AP whose first term is 8 and the common difference is 20, is equal to the sum of first 2n terms of another AP whose first terms is -30 and the common difference is 8. find n

The sum of the first n terms of an AP whose first term is 8 and the common difference is 20 is equal to the sum of first 2n terms of another AP whose first term is -30 and the common difference is 8. Find n.

The sum of the n terms of an AP is 2n^2+5n and its common difference is 6, then its first term is