F.5 Probability.--,-.-0,-
2011-07-03 3:42 am
A fair dice is thrown 6 times. What is the probability that "1" occurs exactly 3 times?
回答 (1)
2011-07-03 4:00 am
✔ 最佳答案
the probability that "1" occurs exactly 3 times=(6C3)((1/6)^3)((1-1/6)^3)
=625/11664
where 6C3 =6!/(3!*(6-3)!)
2011-07-03 15:43:39 補充：
yes, 6C3 means the number of combinations of three "1" and three non-"1" arrangement in six times throwing the dice
收錄日期: 2021-04-13 18:04:18
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20110702000051KK00845