probability
2012-02-18 2:39 am
in a certain exhibition,5 different honda cars and 3 different yoyota cars are displayed in two rows of four randomly.find the probability that the 3 toyota cars are parked in the same row.
回答 (1)
2012-02-18 7:44 pm
✔ 最佳答案
3 different yoyota cars are parked in a row : 4P3 ways 3 different yoyota cars are parked randomly : (5+3)P3 ways
P(E)= (4P3 + 4P3) / (5+3)P3= (24 + 24) / 336= 1/7
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https://hk.answers.yahoo.com/question/index?qid=20120217000051KK01543