The sum of an A.P. is 525. If its first term is 3 and the last term is 39 then its common difference is

The sum of a series of terms in A.P. is 128. If the first term is 2 and the last term is 14, find the common difference.

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

If the first term of an A.P. is 100 and the sum of its first 6 terms is five times the sum of the next 6 terms then its common difference is

The sum of the first 8 terms of an A.P. is 100 and the sum of its first 19 terms is 551. Find the first term and the common difference of the AP.

If the first term of an A.P. is 3 and the sum of its first 25 terms is equal to the sum of its next 15 terms, then the common difference of this A.P. is:

If the sum of the first ten terms of an A.P is four times the sum of its first five terms, the ratio of the first term to the common difference is:

If the sum of the first ten terms of an A.P is four times the sum of its first five terms, the ratio of the first term to the common difference is:

If the sum of the first ten terms of an A.P is four times the sum of its first five terms, the ratio of the first term to the common difference is:

If the first and the last terms of an A.P. are -4 and 146 respectively and the sum of this A.P. is 7171 then its common difference is

In an A.P.the first term is 2, the last term is 29 and sum of the terms is 155. Find the common difference of the A.P.