Where is "here"? I didn't encounter Bayes' Rule in an academic setting until I took a finite maths class at university (in Arizona, US).

Edit: Well, actually I was recommended a book called Choice and Chance by Brian Skyrms by a philosophy professor which explicitly teaches it in the context of Bayesian epistemology, but that was the result of out-of-class conversation and was not related to any particular course I was taking. BTW, I whole-heartedly recommend the book as an introduction to inductive logic.