there are six S5 classes in a school . find the number of ways to arrange six S5 students to the six classes if
(a ) all of them study in the same class
(b) all of them study in different classes
(c) exactly three of them study in s5A
F5 Maths
2014-01-04 5:21 am
回答 (2)
2014-01-06 4:17 am
✔ 最佳答案
a)6C1 = 6 ways b)6P6 = 6! = 720 ways
c)
6C3 × (6 - 1)³ = 2500 ways
2014-01-08 6:58 pm
一班入面有幾多人???
收錄日期: 2021-04-21 22:27:36
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