7.1, due March 2

1. The last example on page 163, that continues onto page 164 was kind of confusing to me when I read it, so I think I'll need a little help understanding that example better.
2. I like that a group has a lot of the same properties as a ring, and so it hopefully won't be too hard to remember what you need to test to see if something is a group or not. I also like permutations, I feel like I understand what those are and how to find them.