If the sum of the first two terms and the sum of the first four terms of a geometric progression with positive common ratio are 8 and 80 respectively, then what is the 6th term?

The sum of the first eight terms of a G.P. is five xx the sum of the first four terms; then the common ratio is

If the ratio of the sum of first three terms to the sum of next three terms of a geometric series be 125:27,then the common ratio of the series be

The sum of first three terms of a Geometric Progression is 13/12 and their product is -1. Find the common ratio and the terms.

If the ratio of the sum of first three terms to the sum of next three terms of a geometric series be 125:27 ,then the common ratio of the series be

What is the sum of the first 13 terms of an arithmetic progression, if the 5th term is 1 and the 8th term is - 17?

The first two terms of a geometric progression add up to 12. The sum of the third and the fourth terms is 48. If the terms of the geometric progression are alternately positive and negative, then the first term is

The first two terms of a geometric progression add up to 12. The sum of the third and the fourth terms is 48. If the terms of the geometric progression are alternately positive and negative, then the first term is

The first two terms of a geometric progression add up to 12. The sum of the third and the fourth terms is 48. If the terms of the geometric progression are alternately positive and negative, then the first term is