国际顶尖MBA申请交流平台--TOPWAY MBA

标题: 问一道prep的数学题 [打印本页]

作者: dypig1234 时间: 2011-11-12 07:06 标题: 问一道prep的数学题

A contest will consist of n questions, each of which is to be answered either "true" or "false". Anyone who answers all n questions correctly will be a winner. What is the least value of n for which the possibility is less than 1/1000 that a person who randomly guesses the answer to each question will be a winner?
答案：10

作者: glaxosmith 时间: 2011-11-13 06:48

答对几率1/2

2^3=8
2^6=64
2^9=512
2^10=1024

1/1024< 1/1000

作者: triangel8866 时间: 2011-11-13 20:23

这不就是求（1/2）的N次方小于1/1000么。。。。。就是2的n次方大于1000，n最小取10吧。。。。

作者: buttonwood 时间: 2011-11-15 06:30

顶楼上，对1024敏感的话，这题能秒杀~~

欢迎光临国际顶尖MBA申请交流平台--TOPWAY MBA (http://forum.topway.org/)