一道ACM校赛题-大家来帮我看看啊 - 小组 - 伯乐在线


一道ACM校赛题-大家来帮我看看啊 - 小组 - 伯乐在线
甲和乙相约晚上 7 点到 8 点之间在体育馆会面,商定先到者等候 15 分钟,如果仍然不见对方就不再等下去。
假如甲和乙的抵达时间在 7 点到 8 点之间,问他们二人会面的可能性有多大?
问题抽象并编写程序。
http://www.mofangge.com/html/qDetail/02/g0/201312/rkglg002403881.html
由题意知本题是一个几何概型,
∵试验发生包含的所有事件对应的集合是Ω={(x,y)|0<x<60,0<y<60}
集合对应的面积是边长为60的正方形的面积SΩ=60×60,
而满足条件的事件对应的集合是A={(x,y)|0<x<60,0<y<60,|x-y|≤15}

魔方格

得到SA=60×60-(60-15)×(60-15)
∴两人能够会面的概率P=
60×60-(60-15)×(60-15)
60×60
=
7
16

故答案为:
7
16
Read full article from 一道ACM校赛题-大家来帮我看看啊 - 小组 - 伯乐在线

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