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【简答题】
Mike had planed to visit a friend in another city. The chance that he took train, ship, bus and plane was 0.3, 0.2, 0.1 and 0.4, respectively. If Mike had chosen the train, the chance he would have be late was 1/4, if the ship, 1/3 and if the bus, 1/12. He would have not been late by the air. At last, Mike was late. What is the probability he came by train?
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