### Home > PC > Chapter 8 > Lesson 8.2.4 > Problem 8-123

8-123.

Find the sum of the following infinite geometric series. If the answer is “∞,” explain why. Homework Help ✎

*a*+ 0.9*a*+ 0.81*a*+ 0.729*a*+ …1 + 1.1 + 1.21 + 1.331 + …

The sum would be ∞ because *r* > 1.