請詳細步驟教我計以下三條(最好有講解,因為唔明),不要網址回答.
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急! F5 排列求Probability 05d3
2012-08-26 5:19 am
回答 (2)
2012-08-27 4:45 am
✔ 最佳答案
7a) 3C2 x 3C1=9
7b) (3C2 x 3C1) / 4^3
=9/64
8) (3C2 x 3C1 x 3C1) / 6^3
=1/8
9a) 5C2 = 10
b) 3C2 =3
c) 3C2/5C2
=3/10
2012-08-26 6:39 am
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I hope the solution can help you^^"
2012-08-27 07:51:28 補充：
(1C1)^2(3C1)(3C2)
for only 1 B, therefore 1b must be hit => 1C1 ^2
then either 3 times there are 2 times B is hit, therefore 3C2
furthermore, besides that two times, either one of A,C,D must be hit, therefore 3C1
參考: I hope the solution can help you^^”
收錄日期: 2021-04-13 18:57:06
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20120825000051KK00710