Answer:
Sum of the first 3 terms is 9245
See explanation below
Step-by-step 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
