作者Mature (麻药麻不倒我…= =)
看板GRE_Verbal
标题Re: [计量] 请教一题数学
时间Mon Aug 25 12:48:43 2008
※ 引述《murai111 (明镜止水)》之铭言：
: ※ 引述《stare (starE)》之铭言：
: : 来自於印度JJ
: : 4. There are rooms from 101 to 550 inclusive in which the starting
: rooms are numbered from 1, 2, 3 and the waiting rooms are numbered
: from 4,5,6. What is the probability that the rooms 4, 5, 6 will be
: choosed randomly?
: : 看不太懂题义>"<
: 房间从101到550
: 房号1 2 3开头的为STARTING ROOM
: 4 5 6为waiting room
: 选到4 5 6开头的机会有多少
: 韩网的解法 应该是这个翻义
the number of the starting rooms=399-101+1=299
the number of the waiting rooms=550-400+1=151
the probability that the rooms 4, 5, 6 will be choosed randomly
151
=------------------
299+151
不知道是不是这样XD
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