### Home > CALC > Chapter 9 > Lesson 9.1.2 > Problem9-32

9-32.

An alternating series, such as $100 − 80 + 64 − 51.2 + ...$, has terms that alternate in sign ($+$ and $−$).

1. Find the common ratio for $100 − 80 + 64 − 51.2 + ...$

2. Find the sum of this infinite series.