A doctor is to visit a patient. From the past
experience, it is known that the probabilities
that he will come by train, bus, scooter or by
other means of transport are respectively
3/10 , 1/5 , 1/10
and
2/5. the probabilities that he will
be late are 1/4 , 1/3 , and1/12 . if he comes by
bus and scooter respectively, but if he comes
by other means of transport, then he will not
be late. If he arrives late, then what is the
probability that he comes by train.
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