Find the sum of first n terms and the sum of first 5 terms of the geometric series 1 + `2/3`+`4/9``+dotdotdot`

Find sum of first 10 terms of geometric series 3,9, 27,……

If the sum of the first n terms of the series

The sum of first 8 terms of the geometric series 2+6+18+54+ . . . Is

Find the sum of first n terms of the series 1.3 + 2.5 + 3.7 + 4.9 +…..

Find the sum of first n terms of the series 1^(3) + 3^(3) + 5^(3) +…

Find the sum of first n terms of the series 1^(3) + 3^(3) + 5^(3) +…

Find the sum of first n terms of the series whose nth term is 3n^(2)+5 .

The nth term of a series is 3^n + 2n ; find the sum of first n terms of the series.

The nth term of a series is 3^(n)+2n; find the sum of first n terms of the series.

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