Which Equation Represents The Partial Sum Of The Geometric Series? 125 + 25 + 5 + 1. The more common formula for the sum of a geometric sequence is: To find the partial sum of the geometric series, we use the formula for the sum of the first n terms of a geometric sequence:
The first term (a) of the series is 125, and the common ratio (r) can be. The more common formula for the sum of a geometric sequence is: To find the partial sum of the geometric series, we use the formula for the sum of the first n terms of a geometric sequence: