Either he's fixed it since the two of you wrote what you wrote, or you're wrong, or I'm terribly confused. It now says (with obvious abbreviations)
P(A|B) = P(B|A)P(A)/P(B)
which is correct.
Either he's fixed it since the two of you wrote what you wrote, or you're wrong, or I'm terribly confused.
Make that all four of us are wrong. Yes, it seems that the cartoon has been fixed. I quadruple checked the positions of those clauses when I was verifying nshepperd's claim, since it was surprising. I also observed at the time that it is fortunate that the image would be easy to fix even with my meagre gimp skills. Or MSPaint from windows 95 for that matter.
EDIT: The xkcd forum confirms our sanity and shows the original.
A fun comic about seashells and Bayes' Theorem. http://xkcd.com/1236/