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Black Pearls and the Bad Husband
[版面:大脑工作室][首篇作者:rungriffin] , 2010年02月02日13:44:14 ,232次阅读,4次回复
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rungriffin
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发信人: rungriffin (tobe,nottobe), 信区: BrainTeaser
标  题: Black Pearls and the Bad Husband
发信站: BBS 未名空间站 (Tue Feb  2 13:44:15 2010, 美东)

Ray is trying to avoid buying his wife the rare black pearls she wants for
Valentine's Day.  He proposes a game: Ray puts 50 black pearls in a box and
50 fake white pearls in another.  He says, "Divide the pearls any way you
want between the boxes.  Then I'll blindfold you and shuffle the boxes.  You
tap one box and pick a pearl from it.  That's what you'll get."

The Question: Can Ray's long-suffering wife mix up the pearls to improve her
chances?

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hero080
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发信人: hero080 (APM=080), 信区: BrainTeaser
标  题: Re: Black Pearls and the Bad Husband
发信站: BBS 未名空间站 (Tue Feb  2 14:39:50 2010, 美东)

1B | 49B50W

【 在 rungriffin (tobe,nottobe) 的大作中提到: 】
: Ray is trying to avoid buying his wife the rare black pearls she wants for
: Valentine's Day.  He proposes a game: Ray puts 50 black pearls in a box
and
: 50 fake white pearls in another.  He says, "Divide the pearls any way you
: want between the boxes.  Then I'll blindfold you and shuffle the boxes. 
You
:  tap one box and pick a pearl from it.  That's what you'll get."
: The Question: Can Ray's long-suffering wife mix up the pearls to improve
her
:  chances?


--
Welcome to use my Scottrade reference code to get 3 Free trades:
GELX0131
after you have done that, ask me to give you 100 baozi ^_^



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flymole
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发信人: flymole (费解), 信区: BrainTeaser
标  题: Re: Black Pearls and the Bad Husband
发信站: BBS 未名空间站 (Wed Feb  3 00:03:38 2010, 美东)

为什么?
【 在 hero080 (APM=080) 的大作中提到: 】
: 1B | 49B50W
: and
: You
: her



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aOzu
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发信人: aOzu (zuzu), 信区: BrainTeaser
标  题: Re: Black Pearls and the Bad Husband
发信站: BBS 未名空间站 (Wed Feb  3 00:10:18 2010, 美东)

?
【 在 hero080 (APM=080) 的大作中提到: 】
: 1B | 49B50W
: and
: You
: her


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braving
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发信人: braving (water_mirror), 信区: BrainTeaser
标  题: Re: Black Pearls and the Bad Husband
发信站: BBS 未名空间站 (Wed Feb  3 00:34:27 2010, 美东)

这样就有  0.5 * 1 + 0.5 * (49/99) 的概率买黑的

【 在 aOzu (zuzu) 的大作中提到: 】
: ?



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