The first term of an arithmetic progression is loga and the second term is logb. Express the sum to 'n' terms as a logarithm.

The sum of the first three terms of an arithmetic progression is 9 and the sum of their squares is 35. The sum of the first n terms of the series can be

The sum of 40 terms of an arithmetic progression is 430 and the sum of 60 terms is 945. Find the 20th term.

If the sum of the first 100 terms of an arithmetic progression is -1 and the sum of the even terms is 1, then the 100^("th") term of the arithmetic progression is

The first term of an arithmetic progression is 1 and the sum of the first nine terms equal to 369. The first and the ninth term of a geometic progression colncide with the first and the ninth term of the arithmetic progression. Find the seventh term of the geometric progression.

The first term of an arithmetic progression is 1 and the sum of the first nine terms equal to 369. The first and the ninth term of a geometric progression coincide with the first and the ninth term of the arithmetic progression.Find the seventh term of the geometric progression.

If the sum of first 100 terms of an arithmetic progression is -1 and the sum of the even terms lying in first 100 terms is 1, then which of the following statement(s) is (are) correct?

In an arithmetic progression the 1st term is 7 and the last term is 28, what is the second term?