Bayes’ theorem
P(A | B) = P(B | A) · P(A) / P(B): a way to turn P(B | A) into P(A | B) using the base rate.
Bayes’ theorem is the same counting written as a formula.
See it in action
Try bayes’ theorem hands-on in the lesson Probability and Bayes, part of the The maths behind AI course.