tag:blogger.com,1999:blog-4010478591191633760.post7546186343281914410..comments2024-03-22T08:04:05.869-07:00Comments on 魚之樂: 數學盲Unknownnoreply@blogger.comBlogger14125tag:blogger.com,1999:blog-4010478591191633760.post-14947694149970835272010-07-13T09:29:01.110-07:002010-07-13T09:29:01.110-07:00There was no famous philosopher born on my birthda...There was no famous philosopher born on my birthday.W. Wonghttps://www.blogger.com/profile/07161244576570372004noreply@blogger.comtag:blogger.com,1999:blog-4010478591191633760.post-45879993298960102542010-07-13T07:37:27.202-07:002010-07-13T07:37:27.202-07:00我就讀哲學仲要同盧梭同一日生日!我就讀哲學仲要同盧梭同一日生日!Anonymousnoreply@blogger.comtag:blogger.com,1999:blog-4010478591191633760.post-57191699487075164622010-07-12T10:30:30.971-07:002010-07-12T10:30:30.971-07:00Yan,
//村上春樹與我是同一天生日的。//
- 機會率很低呀!不過,換一個角度看,地球上這麼...Yan,<br /><br />//村上春樹與我是同一天生日的。//<br /><br />- 機會率很低呀!不過,換一個角度看,地球上這麼多人中要有兩個生日相同,機會率卻是極高。W. Wonghttps://www.blogger.com/profile/07161244576570372004noreply@blogger.comtag:blogger.com,1999:blog-4010478591191633760.post-40914395717174832942010-07-12T10:30:20.034-07:002010-07-12T10:30:20.034-07:00先看這個最簡單的例子,就是只有兩個人,他們同一天生日的機會怎樣計法:
- 一年有365日,所以一個...先看這個最簡單的例子,就是只有兩個人,他們同一天生日的機會怎樣計法:<br /><br />- 一年有365日,所以一個人的生日有365個可能。<br />- 兩個人的生日就有365x365個可能的組合。<br />- 但假如兩人的生日要不同,就只有365x364個可能的組合。<br />- 因此,兩人生日不同的機會率是(365x364)/(365x365)。<br />- 兩人生日相同的機會率就是1減他們生日不同的機會率,即是1-(365x364)/(365x365) 。<br /><br />如果有五個人:<br /><br />- 五人生日全不相同的機會率是(365x364x363x362x361)/ (365x365x365x365x365)<br />- 五人中至少有兩人生日相同的機會率就是1減他們生日全不相同的機會率,即是1-(365x364x363x362x361)/ (365x365x365x365x365)<br /><br />如此類推,就可以計出有23人或40人時的機會率。W. Wonghttps://www.blogger.com/profile/07161244576570372004noreply@blogger.comtag:blogger.com,1999:blog-4010478591191633760.post-72425100858983074192010-07-12T07:15:56.236-07:002010-07-12T07:15:56.236-07:00可以解釋一下為什麼23個人就可以50%,40人就可以90%嗎?
小弟想不通
謝謝可以解釋一下為什麼23個人就可以50%,40人就可以90%嗎?<br />小弟想不通<br />謝謝Anonymousnoreply@blogger.comtag:blogger.com,1999:blog-4010478591191633760.post-16959706566225016002010-07-12T02:39:49.175-07:002010-07-12T02:39:49.175-07:00村上春樹與我是同一天生日的。村上春樹與我是同一天生日的。Yanhttps://www.blogger.com/profile/05543452661425487649noreply@blogger.comtag:blogger.com,1999:blog-4010478591191633760.post-39940909867824364482010-07-11T21:53:33.178-07:002010-07-11T21:53:33.178-07:00CYC,
//我剛下載了這本書並讀了第一章前半。
God bless the Internet....CYC,<br /><br />//我剛下載了這本書並讀了第一章前半。<br /><br />God bless the Internet.Yanhttps://www.blogger.com/profile/05543452661425487649noreply@blogger.comtag:blogger.com,1999:blog-4010478591191633760.post-25712577172952009992010-07-11T16:32:46.683-07:002010-07-11T16:32:46.683-07:00Chris,
那麼你和她算是有緣吧。Chris,<br /><br />那麼你和她算是有緣吧。W. Wonghttps://www.blogger.com/profile/07161244576570372004noreply@blogger.comtag:blogger.com,1999:blog-4010478591191633760.post-33799962969207064962010-07-11T16:31:47.903-07:002010-07-11T16:31:47.903-07:00Lin,
Exactly. That's what I said. If you star...Lin,<br /><br />Exactly. That's what I said. If you start with a specific birthday, then there have to be 253 people for there to be 50% chance of there being another person with the same birthday.W. Wonghttps://www.blogger.com/profile/07161244576570372004noreply@blogger.comtag:blogger.com,1999:blog-4010478591191633760.post-63003416254701263492010-07-11T16:20:27.900-07:002010-07-11T16:20:27.900-07:00"(2) 如果你參加一個只有大約有二十人的派對,竟遇到一個跟你同一天生日的人,你會覺得跟他..."(2) 如果你參加一個只有大約有二十人的派對,竟遇到一個跟你同一天生日的人,你會覺得跟他(她)特別有緣嗎?其實只要有二十三人,其中兩人生日相同的機會已是百分之五十(只計月日,不計年份);假如有四十人,機會便增至大約百分之九十。當然,如果你要相信跟某人有緣,這些數字是不能阻止你的。"<br /><br />The 50% chance with 23 people you are referring to is about having any two people in the group sharing the same birthday. It's not the probability of having someone with share MY birthday.<br /><br />LinAnonymousnoreply@blogger.comtag:blogger.com,1999:blog-4010478591191633760.post-32929806512274601082010-07-11T15:09:47.890-07:002010-07-11T15:09:47.890-07:00我有個大學女同學,和我同年同月出生,同系同年畢業,雖然不同時間考入香港政府工作,但是有段時間共事同一...我有個大學女同學,和我同年同月出生,同系同年畢業,雖然不同時間考入香港政府工作,但是有段時間共事同一部門。Chrishttps://www.blogger.com/profile/10133122741874926109noreply@blogger.comtag:blogger.com,1999:blog-4010478591191633760.post-56681090513491777622010-07-11T14:51:38.298-07:002010-07-11T14:51:38.298-07:00一個稱GIGAPEDIA的網站(你需要注冊才能真正找到下載)。
除了通俗書外,我每天都在那裏找到很...一個稱GIGAPEDIA的網站(你需要注冊才能真正找到下載)。<br /><br />除了通俗書外,我每天都在那裏找到很多學術書。比如你昨天提的那些哲學書,全都可以找到。<br /><br />(這本E書比較可惜的地方是,它的排版和原文不同,而且沒有頁數)CYCnoreply@blogger.comtag:blogger.com,1999:blog-4010478591191633760.post-65180216721283793802010-07-11T14:38:24.233-07:002010-07-11T14:38:24.233-07:00CYC,
你在哪裏下載的?CYC,<br /><br />你在哪裏下載的?W. Wonghttps://www.blogger.com/profile/07161244576570372004noreply@blogger.comtag:blogger.com,1999:blog-4010478591191633760.post-39188349505106855842010-07-11T14:35:36.977-07:002010-07-11T14:35:36.977-07:00我剛下載了這本書並讀了第一章前半。真的挺有趣,而且並不難讀。我剛下載了這本書並讀了第一章前半。真的挺有趣,而且並不難讀。CYCnoreply@blogger.com