[數撚圍爐區]可能係最後一個post(36)

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2020-05-22 19:28:29
2020-05-22 19:55:40
有無人識依兩條permutation 題目

1) Pauline has 1 dictionary, 1 comic and 5 different fictions. She wants to put 4 books on the lower shelf and 3 books on the upper shelf. If the dictionary and the comic are put in different shelf, find the number of arrangements of the books.

2) 6 children are arranged to sit in a row. And each one raises one hand before a teacher takes a photo of them. In how many ways can the children be arranged to sit with each one raising one hand.
2020-05-22 20:14:35
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2條題目 都係permutation
1) 2880
2) 46080
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第一題 用nPr既話 點計
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求解
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