标题: 本月一道逻辑题变体 求解 [打印本页] 作者: 酱子啊 时间: 2011-11-8 02:58 标题: 本月一道逻辑题变体 求解 Fact:Asthma, a bronchial condition, is much less common ailment than hay fever, an allergic inflammation of the nasal passages.
Fact:Over 95 percent of people who have asthma also suffer from hay fever.
If the information given as facts above is true, which of the following must also be true?
A.Hay fever is a prerequisite for the development of asthma.
B.Asthma is a prerequisite for the development of hay fever.
C.Those who have neither hay fever nor asthma comprise less than 5 percent of the total population.
D.The number of people who have both of these ailments is greater than the number of people who have only one of them.
E.The percentage of people suffering from hay fever who also have asthma is lower than 95 percent 作者: 三颗猫饼干 时间: 2011-11-8 03:57
这不是gwd上的题目么？作者: 酱子啊 时间: 2011-11-8 04:00
这不是gwd上的题目么？
-- by 会员 三颗猫饼干 (2011/11/8 3:57:20)
是的 你告诉我答案吗？？？我找不到原题作者: cq168088 时间: 2011-11-8 05:19
E。用排除法做的。不能理解为何E对。作者: paopao20 时间: 2011-11-8 08:46
画两个韦恩图，Asthma的圈圈要比hay fever的圈圈小， 两个圈圈重叠部分就是‘Over 95 percent of people who have asthma also suffer from hay fever’，但是对于A 来说的95%必然对HF来说要小于95%，后者的圈圈大，重叠部分占到它整个的比例小作者: 三颗猫饼干 时间: 2011-11-8 11:19
E.作者: 三颗猫饼干 时间: 2011-11-8 11:20
我看bible的时候突然明白的。题目说的是 percent 。所以答案中的number那个肯定不对。AB不沾边。C的范围不对。D 是number吧。number和percent不是一个概念。E作者: 三颗猫饼干 时间: 2011-11-8 11:21
你可以看bible最后一篇吧。好像是，讲数学和百分比的。就是说这等考题的tricky之处。