Sum of last two terms of an A.P. is 60. If first term is 11 and common differences 2, then the number of termsin the A.P. is :

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

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

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

In an A.P. the difference between the last and the first terms is 632 and the commons difference is 4. Then the number of terms in the A.P. is

The first and the last terms of an A.P are 17 and 9 . If common difference is -2 , then find the number of terms and their sum.

For an A.P., the sum of its terms is 60, common difference is 2 and last term is 18. Find the number of terms in the A.P.

The first term of an A.P is 2 and last term is 59. Find the common difference if sum of all terms is 610 .

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.

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.