Consider an experiment in which two smartphones are randomly selected from an assembly line during manufacturing. The defective status—defective (D) or not (N)—of each is determined. The sample points (outcomes) of the experiment are listed in the table (p. 163), where DD represents the event that the first phone is defective and the second is defective, ND represents the event that the first phone is non defective and the second is defective, etc. Suppose the correct probabilities associated with the sample points are as shown. [Note: The necessary properties of assigning probabilities to sample points are satisfied.] Consider the events

Calculate the probability of A and the probability of B.

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A = {Observe exactly one defective.} B = {Observe at least one defective.}