I keep getting “Conditional probability” questions wrong in Probability. What's the trap?
assuming P(A|B) equals P(B|A).
The usual trap: assuming P(A|B) equals P(B|A). How to avoid it: conditioning direction matters — Bayes' theorem flips it correctly. Go back to the definition — P(A|B) is the probability of A given that B has occurred, equal to P(A∩B)/P(B).
Key point
Conditional probability
Common mistake
assuming P(A|B) equals P(B|A).
Memory tip
conditioning direction matters — Bayes' theorem flips it correctly.
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