I logged into post the same comment - instead up-voted yours.
While online courses are often good, I hate the idea of learning math by answering multiple choice questions. The fact that this provides the complete proofs as answers will help one to check their own thought process (assuming they don't cheat and look at the solution without putting in any effort).
While online courses are often good, I hate the idea of learning math by answering multiple choice questions. The fact that this provides the complete proofs as answers will help one to check their own thought process (assuming they don't cheat and look at the solution without putting in any effort).