Students will learn an informal definition of infinite series, and how to use algebra to evaluate certain infinite series. Specifically, students will study:

- \(1 + 2 + 3 + 4 + 5 + \ldots\) (Sum of all the counting numbers)
- \(1 - 1 + 1 - 1 + 1 - \ldots\) (Grandi's series)

Here's a video on finding the sum of all the counting numbers, and here's a video on Grandi's series.