Power Series
Power Series Radius of Convergence
This video introduces the concept of radius of convergence, and takes you through the step-by-step process using the Ratio Test that you'll use for these problems. If you don't remember the ratio test, review this chapter.
Interval of Convergence
Extending on the previous video, these interval of convergence problems start the same way as radius of convergence problems, except that you then must test the endpoints to see if they result in a convergent series.