Nice online intro course to Symbolic Logic

[Arising_uk]

http://oli.web.cmu.edu/openlearning/for ... rses/logic

[Mike Strand]

Thanks, Arising_uk! I bookmarked the site, and I can use it as a supplement to a foundations of math course I'm auditing this semester.

[Arising_uk]

My pleasure Mike.

Theres also a nice intro course to Statistics and Probability, which coincidentally contains a visual explanation to the three-doors problem you posed.