As follows:
圖片參考：http://a.imagehost.org/0170/ScreenHunter_06_Nov_15_12_17.gif
maths~
2009-11-15 8:19 pm
回答 (1)
2009-11-15 8:23 pm
✔ 最佳答案
P(E)= P(4正) + P(3正1反)
= (1/2)^4 + 4C3 [(1/2)^3 * 1/2]
= 1/16 + 1/4
= 5/16
收錄日期: 2021-04-21 22:07:01
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20091115000051KK00514