排列與組合 (true-false question)?
2016-02-04 4:35 pm
Helen answers 5 true-false questions by guessing. Fiinid the probability that she will answer 3 tre-false quesions correctly
回答 (1)
2016-02-04 5:10 pm
✔ 最佳答案
The probability= C(5,3) (1/2)³ C(2,2) (1/2)²
= 5/16
收錄日期: 2021-04-23 23:44:49
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20160204083528AAhgZij