10個計算機,2個損壞.現隨機抽出2個計算機,找出均為壞機概率係???
投擲一骰子三次,擲到<1>,<2>,<3>概率係???
plase explain!!!
f.3 math (10)
2009-04-21 1:00 am
回答 (1)
2009-04-21 1:25 am
✔ 最佳答案
10個計算機,2個損壞.現隨機抽出2個計算機,找出均為壞機概率係???P(均為壞機)= 2/10 x 1/9
=1/45
投擲一骰子三次,擲到<1>,<2>,<3>概率係???
P(擲到<1>,<2>,<3>)=(3/6)3
=1/8
收錄日期: 2021-04-23 20:36:20
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20090420000051KK00896