English

Geometric Series

How to find the value of a geometric series (sum of a geometric sequence): formula, 3 examples, and their solutions.

Formula

Examplea = 3, r = 2, n = 7, S7 = ?

Examplea1 = 4, a4 = 36, S5 = ?

Examplen = 14 5⋅(2/3)n