If first term is 8 and last term is 20 common diffference is 2 . find the value of n when the series are in AP.

Sum of first n terms of an A.P. whose last term is l and common difference is d, is

For an A.P. if the first term is 8 and the common difference is 8, then S_(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 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 first term of an AP.Is,the common difference is 3 and the last term is 80; find the number of terms.

In a sequence of (4n + 1) terms the first (2n + 1) terms are in AP whose common difference is 2, and the last (2n + 1) terms are in GP whose common ratio is 0.5. If the middle terms of the AP and GP are equal, then the middle term of the sequence 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 .

The first term of an A.P. is 5, the common difference is 3 and the last term is 80; find the number of terms.

If for an A.P. the first term is 11 and the common difference is (–2), then find first three terms of A.P.

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.