Here's an example of a non-geometric series that converges due to the collapse of the middle terms. But then, who (besides mothers and babies who don't know any better) likes middle terms anyway? Duration: 8:55

To conclude this lesson, we look at the nth Term Test for Divergence as well as three properties common to any convergent series. By the way, does anyone remember what a contrapositive is? Just wondering. Duration: 14:06

In this Numberphile video, your grandpa explores the three key infinite series. The domino stacking thing is pretty much how I place books on my bookshelves at home. Duration: 9:30