題目：The 5-seater in the last row of a bus is empty and 3 passengers is ready to sit on it. In how many ways can the seats be arranged so that 2 adjacent seats are reserved?
求step and answer!
中五數學題！求解答！ (10點）
2015-05-01 11:54 pm
回答 (2)
2015-05-02 4:46 am
✔ 最佳答案
We can consider the 2 adjacent seats (as the question required) to be "1 seat", so that the case equals to 3 passengers choosing 4 seats to sit.The number of ways is then
= 4P3
= 4!/1!
= 24
(as the permutation of the 3 passengers counts as different ways)
參考: The answer is 24
2015-05-01 11:56 pm
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四個情況，因此是 4 × 3! = 24。
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四個情況，因此是 4 × 3! = 24。
收錄日期: 2021-04-20 15:35:12
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20150501000051KK00039