Mathematics, 06.12.2019 11:31 torresalysabeth

Elizabeth lives in san francisco and works in mountain view. in the morning, she has 3 transportation options (take a bus, a cab, or a train) to work, and in the evening she has the same 3 choices for her trip home.
if elizabeth randomly chooses her ride in the morning and in the evening, what is the probability that she'll use a cab exactly one time?

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