GWD9-13

xiaolingdang

GWD-9-Q13:>>

Fact: Asthma, a bronchial condition, is much less common ailment than hay fever, an allergic inflammation of the nasal passages.>>

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Fact: over 95 percent of people who have asthma also suffer from hay fever.>>

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If the information given as facts above is true, which of the following must also be true?

1. Hay fever is a prerequisite for the development of asthma
2. Asthma is a prerequisite for the development of hay fever
3. Those who have neither hay fever nor asthma comprise less than 5 percent of the total population
4. The number of people who have both of these ailments is greater than the number of people who have only one of them
5. The percentage of people suffering from hay fever who also have asthma is lower than 95 percent.

这题答案是什么? 没有找到相关的帖子,我下载的XY版无重复题上也没有这道的答案

xionghuixh

我选E

A的得病数远远小于H，并且A种95％都会同时感染H，那么取反就是E了

xiaolingdang

取反就是E了?怎么推出来的啊?

britney-gaos

because: "Asthma is much less common ailment than hay fever", 也就是HF的数量会比A多，分母大，比例就小。

sweatflys

言之有理!   

if AS persons are 100, HF persons are 200

96% AS (including HF suffering)=96 persons    96 /200 HF < 96% 

fuhongler

我觉得这个题目不严谨。什么叫much less common？！比如得A的人100个，其中96个FEVER。另外，总共FEVER的人101个，结果是96/101。那么这个小于95%就不成立。所以，OVER 95%到什么程度，MUCH LESS COMMON 到什么程度都将决定结果的。

xiaolingdang

谢谢各位指点！！