http://blog.vckbase.com/arong/category/49.html描述一些简单的利用数学原理计算的算法馨荣家园af.Text Version 0.958.2004.214馨荣家园http://blog.vckbase.com/arong/archive/2007/08/28/28869.htmlTue, 28 Aug 2007 02:25:00 GMThttp://blog.vckbase.com/arong/archive/2007/08/28/28869.htmlhttp://blog.vckbase.com/arong/comments/28869.htmlhttp://blog.vckbase.com/arong/archive/2007/08/28/28869.html#Feedback8http://blog.vckbase.com/arong/comments/commentRss/28869.htmlhttp://blog.vckbase.com/arong/services/trackbacks/28869.html考虑这样一个问题：我们把2个红色球和2个白色球放进一个黑盒子里，问取出两个球颜色相同得概率是多少。<BR><BR>很显然，取出两个球的组合有以下四种：RR, RW,WR,WW，因此同颜色的概率是2/4=0.5<BR><BR>按照乘法原理，我们可以分两次取出。<BR>第一次，我们取出白色的可能性为1/2，剩下的3个球再取出白色的可能性为1/3，因此，两次都取出白色的可能性为1/2 * 1/3 = 1/6<BR>同理，都取出红色的可能性为1/6<BR>那么，取出同种颜色的可能性应该为1/6 + 1/6=1/3<BR><BR>为什么会不一样？<img src ="http://blog.vckbase.com/arong/aggbug/28869.html" width = "1" height = "1" />馨荣家园http://blog.vckbase.com/arong/archive/2004/06/22/498.htmlMon, 21 Jun 2004 22:27:00 GMThttp://blog.vckbase.com/arong/archive/2004/06/22/498.htmlhttp://blog.vckbase.com/arong/comments/498.htmlhttp://blog.vckbase.com/arong/archive/2004/06/22/498.html#Feedback393http://blog.vckbase.com/arong/comments/commentRss/498.htmlhttp://blog.vckbase.com/arong/services/trackbacks/498.html<img src ="http://blog.vckbase.com/arong/aggbug/498.html" width = "1" height = "1" />阿荣陋室http://blog.vckbase.com/arong/archive/2004/05/27/286.htmlWed, 26 May 2004 18:19:00 GMThttp://blog.vckbase.com/arong/archive/2004/05/27/286.htmlhttp://blog.vckbase.com/arong/comments/286.htmlhttp://blog.vckbase.com/arong/archive/2004/05/27/286.html#Feedback12http://blog.vckbase.com/arong/comments/commentRss/286.htmlhttp://blog.vckbase.com/arong/services/trackbacks/286.html<img src ="http://blog.vckbase.com/arong/aggbug/286.html" width = "1" height = "1" />阿荣陋室http://blog.vckbase.com/arong/archive/2004/05/21/256.htmlFri, 21 May 2004 14:32:00 GMThttp://blog.vckbase.com/arong/archive/2004/05/21/256.htmlhttp://blog.vckbase.com/arong/comments/256.htmlhttp://blog.vckbase.com/arong/archive/2004/05/21/256.html#Feedback3http://blog.vckbase.com/arong/comments/commentRss/256.htmlhttp://blog.vckbase.com/arong/services/trackbacks/256.html<img src ="http://blog.vckbase.com/arong/aggbug/256.html" width = "1" height = "1" />