 |  | | A question about 3 cards again |
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發表於: 星期六 九月 22, 2007 7:06 pm |
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| kim |
| 敬拜者 |

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| 註冊時間: 2007-07-29 |
| 文章: 161 |
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Ok, an easy question this time..
There are 3 cards.
The first one is blue on both sides.
The second card is red on both sides.
The third card is red on one side and blue on another.
Now, if you are given one of the card and you see red color face up.
What's the probability of seeing blue when you flip the card? |
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發表於: 星期日 九月 23, 2007 12:19 am |
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| Elix |
| 敬拜者 |

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| 註冊時間: 2007-07-24 |
| 文章: 103 |
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1/2 ??  |
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發表於: 星期日 九月 23, 2007 12:32 am |
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| kim |
| 敬拜者 |

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| 註冊時間: 2007-07-29 |
| 文章: 161 |
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so let's say this
We label our cards the following way
the blue card has two sides, so one side is Blue1, while the other side is Blue2.
the red card has two sides, so one side is Red1, while the other side is Red2.
now, the mix card has one red side, let's just call it Red, and we call the blue side Blue.
by saying it's 1/2, you implicitly assume that you can only have the following situation,
you get (red card this way)
Red1 - Red2
or you get (mix card this)
Red - Blue.
But, that's not all the possibilities. |
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發表於: 星期一 九月 24, 2007 12:41 pm |
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| kim |
| 敬拜者 |

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| 註冊時間: 2007-07-29 |
| 文章: 161 |
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發表於: 星期一 九月 24, 2007 12:42 pm |
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| kim |
| 敬拜者 |

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| 註冊時間: 2007-07-29 |
| 文章: 161 |
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| Well, that's what I think.. let me know if any person dont agree |
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發表於: 星期一 九月 24, 2007 9:36 pm |
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| Elix |
| 敬拜者 |

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| 註冊時間: 2007-07-24 |
| 文章: 103 |
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| do you mean red1-red2 and red2-red1 are different? |
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發表於: 星期一 九月 24, 2007 10:32 pm |
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| kim |
| 敬拜者 |

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| 註冊時間: 2007-07-29 |
| 文章: 161 |
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| yes, they are different cases. |
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發表於: 星期一 九月 24, 2007 11:17 pm |
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| CHS |
| 祷告勇士 |

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| 註冊時間: 2007-09-12 |
| 文章: 75 |
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| 我觉得不是1/3,我比较喜欢电话讨论……打字好累…… |
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_________________ 在月黑风高的白天,只有沐浴露和狗狗在打架——大家好我是Jack,我又来了——想吃鸡翅膀却不想翘课但是还是想翘课去吃鸡翅膀的Jack |
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發表於: 星期一 九月 24, 2007 11:23 pm |
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| CHS |
| 祷告勇士 |

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| 註冊時間: 2007-09-12 |
| 文章: 75 |
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我大概认为:几率不会消失也不会增加。但是,在一开始,你拿到一张(蓝/红)卡的时候,几率已经消失了,因为,你如果拿到一张红卡,给你卡的人永远不可能给你一张两边都是红的,同样,不可以给你双色卡的红的一面,所以,这已经不是ramden variable,于是,消失的几率,就会转移到剩下的两张卡上,但是怎么转移,我还在想……我觉得应该转移到你拿到的那张卡,因为如果你拿到红色的卡,剩下的那一张红色的卡的状态没有改变,但是……转到之后会怎么样呢?……
我觉得几率的转移和以前的那个问题时一样的,一开始的选择丧失了几率……
(以上分析99%是不正确的,仅供反面参考)  |
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_________________ 在月黑风高的白天,只有沐浴露和狗狗在打架——大家好我是Jack,我又来了——想吃鸡翅膀却不想翘课但是还是想翘课去吃鸡翅膀的Jack |
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發表於: 星期二 九月 25, 2007 1:29 am |
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| kim |
| 敬拜者 |

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| 註冊時間: 2007-07-29 |
| 文章: 161 |
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NO, this is very different from the other 3 card question we talked about an year ago..
In this case, you might actually get a card which is red color on both side |
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