Question

For a geometric series represented by ++2+3,..., wherein is the first term and the common ratio, calculate the sum of the first 3 terms, wherein =15,=6 ?

Answer 1

Sum of the first 3 terms is 9245

See explanation below

Explanation:

The question is not clear. From the question we can tell we are to determine the sum of the first 3 terms of a geometric series. I would show you how to calculate sum of n terms given first term and common ratio.

Let's consider the question below.

Given that the first term is 15 and the common ratio is 6, find the first 3 terms

Solution:

Sum of geometric series has two formulas: one is for common ratio(r) > 1 and the other is for common ratio (r) < 1

Since the r in the question is > 1. We would apply the formular that applies to it.

Sum of the first 3 terms is 9245

See attachment for detail