#1: Author: 青木, Posted: 2013-1-12 10:05
两个人相约每天5点到6点间相会,先到者等候另一人20分钟,过时就离去,求两人能见面的概率?
答案是55.56%。
要求过程。
#2: Author: 任飞翔, Posted: 2013-1-12 10:18
75%
#3: Author: 四叶草, Posted: 2013-1-12 12:25
1-(40/60)^2
#4: Author: 青木, Posted: 2013-1-12 13:55
四叶草 _BBCODE_WROTE:
1-(40/60)^2
#5: Author: 步步为营, Posted: 2013-1-12 15:39
1/60 * (20/60 + 21/60 + 。。。+39/60+40/60+。。。+39/60+。。。+20/60)=55%。
output generated using printer-friendly topic mod, All times are GMT - 8 Hours