This topic is in the 'Sequences and Series' section. Sequences and Series are a lot of fun, because they are all about exploring interesting patterns that numbers can make. There's a famous story about Gauss, one of the greatest mathematicians in history, outsmarting his elementary school math teacher one day by discovering a beautiful pattern in a sequence that the teacher had given the class for busywork. The teacher said, add up 1+2+3+4+..all the way up to 1000. While all the students went to work, adding each number together, Gauss saw a beautiful pattern and solved the problem in just a few steps! He used a beautiful property of arithmetic sequences, and it's just one of the things that you'll learn about in this section. So if you like looking for patterns and figuring out clever ways to use patterns to your advantage, then you're going to like this section a lot!