I. Definition

Given a series (list of values): a₁, a₁r, a₁r², a₁r³, .......,a₁r^n-1

The Series is Geometric if the ratio, r of consecutive terms are the same

II. The n-th term of Geometric sequence is:

III. The sum of a finite Geometric sequence:

III. The sum of a infinite Geometric sequence when |r| < 1