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Khan Academy
Khan Academy: Probability: Probability (Part 7)
Video lesson finding the conditional probability of an event by looking at the sample space. Bayes' theorem is derived. [10:05]
Khan Academy
Khan Academy: Probability: Probability (Part 8)
Video lesson finding the conditional probability with fair coins and a coin with two-heads using Bayes' theorem. Includes an explanation of the solution using an area diagram. [5:23]