推 SONGya168:格式請修正 09/28 00:00
(1)Ten passengers get into a train that has three cars.
Assuming a random placement of passengers,what is the
probability that the first car will contain three of them?
(2)A train and a bus arrive at the station at random between 9 A.M.
and 10 A.M. The train stops for 10 minutes and the bus for x minutes.
Find x so that the probability that the bus and the train will meet
equals 0.5.
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