UVA11346 概率 Probability

Description

[problemUrl]: https://uva.onlinejudge.org/index.php?option=com_onlinejudge&Itemid=8&category=25&page=show_problem&problem=2321 [PDF](https://uva.onlinejudge.org/external/113/p11346.pdf) ![](https://cdn.luogu.com.cn/upload/vjudge_pic/UVA11346/c247604e291757a3a3610575f0efe48dea48c400.png)

Input Format

![](https://cdn.luogu.com.cn/upload/vjudge_pic/UVA11346/cf0805442f4307001393d3d7017759cd4495ec1d.png)

Output Format

![](https://cdn.luogu.com.cn/upload/vjudge_pic/UVA11346/52dc8c560b3dbd4b2b6e47de928c41d4587132da.png)