Q25:
A certain roller coaster has 3 cars, and a passenger is equally likely to ride in any 1 of the 3 cars each time that passenger rides the roller coaster.If a certain passenger is to ride the roller coaster 3 times, what is the probability that the passenger will ride in each of the 3 cars?
A.0
B.1/9
C.2/9
D.1/3
E.1
Answer:
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Q26:
There are 8 books on a shelf, of which 2 are paperbacks and 6 are hardbacks.How many possible selections of 4 books from this self include at least one paperback?
A.40
B.45
C.50
D.55
E.60
Answer:
两道PROBABILITY的一同错了！！！求教555555！！！
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发表于 2010-11-23 16:58:24
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