29 May 2013 @ 2:10 AM 
 

進階教學(14)—-紅白黑3色球，紅球先取完

 

進階教學(14)—-紅白黑3色球，紅球先取完


袋中有紅球4個、白球3個、黑球5個，且每個球被取到機率相等，
今每次取出一球不放回袋中，連續取球，則紅球先取完的機率為?

(詳解)

P(紅球先取完)

＝P(在最後一球為白球的條件下，紅球比黑球先取完)+

P(在最後一球為黑球的條件下，紅球比白球先取完)

得答案為

Tags Categories: 數學 Posted By: 我是大富翁
Last Edit: 29 May 2013 @ 05 16 AM

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