The geometric series formula refers to the formula that gives the sum of a finite geometric sequence, the sum of an infinite geometric series, and the n th term of a geometric sequence. Where the first term, a = -4 and the common ratio r = -1/2 Where the first tern, a = 1/2 and the common ratio, r = 1/2 Here are some examples of geometric series. There can be two types of geometric series: finite and infinite. In particular, the geometric series means the sum of the terms that have a common ratio between every adjacent two of them. , the corresponding geometric series is a + ar + ar 2 +. Finding the sum of an infinite geometric series.Ī geometric series is the sum of finite or infinite terms of a geometric sequence.Finding the sum of a finite geometric series.Formula to find the n th term of a geometric series.It is a series (sum of terms) where the ratios of every two consecutive terms are the same. Before knowing the geometric series formula, let us recall what is a geometric series.
