Three patients are accepted into a clinical trial for a new drug. According to the severity of the condition of each patient, the doctors estimate that the probability that the drug will be effective for Patient A is 0.7, the probability that it will be effective for Patient B is 0.2, and the probability that it will be effective for Patient C is 0.6. Assume that the success of the drug for the three patients is independent.

a. Draw a tree diagram displaying all outcomes and joint probabilities measuring the effectiveness of the drug for all three patients.

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