If the first term of an AP is 1 and the common difference is 2 then the sum of first 26 term is​

If the first term of an AP is -5 and the common difference is 2, then the sum of the first 6 terms is

If the first term of an A.P is -1 and common difference is -3, then 12thterm is

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.

The 5th term of an AP is -3 and its common difference is -4. The sum of its first 10 terms is

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

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 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 six terms of an AP is 48 and the common difference is 2. What is the 4th term of AP ?

[" If the first term of an A.P is an integer with common difference "2" ,then the number of possible values of k for which the sum of first k terms is "153" is "(k>1)]