Question

A commuter crosses one of three bridges, A, B, or C, to go home from work....

A commuter crosses one of three bridges, A, B, or C, to go home from work. The commuter crosses A with probability 1/3, B with probability 1/6, and C with probability 1/2. The commuter arrives home by 6 p.m. 75%, 60%, and 50% of the time by crossing bridges A, B, and C, respectively. If the commuter arrives home by 6 p.m., find the probability that bridge A was used. Also find the probabilities for bridges B and C.

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