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标题: 数学易错的两个英语词组 [打印本页]
作者: Akiii 时间: 2018-10-4 13:35
标题: 数学易错的两个英语词组
is preceded by 后面的东西在前面
is followed by 后面的东西在后面
一道曼哈顿CAT题目
In a single row of yellow, green and red colored tiles, every red tile is preceded immediately by a yellow tile and every yellow tile is preceded immediately by a green tile. What color is the 24th tile in the row?
(1) The 18th tile in the row is not yellow.
(2) The 19th tile in the row is not green.
It is tempting to view the information in the question as establishing a pattern as follows:
Green, Yellow, Red, Green, Yellow, Red, . . .
However, consider that the following non-pattern is also possible:
Green, Yellow, Red, Green, Green, Green, Green . . .
(1) INSUFFICIENT: This tells us that the 18th tile is Green or Red but this tells us nothing about the 24th tile. Statement (1) alone is NOT sufficient.
(2) INSUFFICIENT: This tells us that the 19th tile is Yellow or Red but this tells us nothing about the 24th tile. Statement (2) alone is NOT sufficient.
(1) AND (2) INSUFFICIENT: Together, the statements yield the following possibilities for the 18th and 19th tiles:
GY, GR, RY, or RR
However, only GY adheres to the rules given in the question. Thus, we know that tile 18 is green and tile 19 is yellow. However, this does not help us to determine the color of the next tile, much less tile 24 (the one asked in the question). For example, the next tile (tile 20) could be green or red. Thus, the statements taken together are still not sufficient.
The correct answer is E.
但是我觉得解析有问题。它说1+2 只能推出GY这种组合我同意，但是按照题目的意思，G一定在Y前面，那么第20个怎么可能是G呢，这道题如果是问第20个我觉得是可以确认是R的。
请大家帮忙看看，谢谢~~
作者: ann2380 时间: 2018-10-4 19:33
第18个是green，第19个是yellow，题目说如果有yellow，前面一定是green，如果有red，前面一定是yellow，但是没说是不是一定有红啊，比如说第20个也可以是green，之后都可以是数个green，没规定green前面是什么，从任意一个位置开始都可以是yellow；第20个也可以是red，那么第21个只能是green，跟前面的情况又一样了；所以都有可能
作者: jeremyooo 时间: 2018-10-4 19:55
我的理解是，只能从后往前推，当你知道R/Y的时候，你可以确定前面的，但是你不能从前往后推，你知道G颜色的时候，不一定后面就是Y的
作者: Akiii 时间: 2018-10-4 20:08
不是，第18个G，第19个Y，如果第20个G,那么Y就在G的前面了。这个不是不符合题目说的 Y一定在G 后面么
作者: Akiii 时间: 2018-10-4 20:11
这个题问第24个颜色，选E没有问题。我的问题是详解里面，如果结合1和结合2，我认为第20个是可以确定的。因为已知18个G，19个Y，后面一定是R。
作者: ann2380 时间: 2018-10-4 23:33
A is preceded by B 的意思是 B在A前面，这里只说了如果有Yellow，前面一定是green，没说green前面不能是yellow
作者: ann2380 时间: 2018-10-4 23:34
换句话说，只说了如果出现yellow，前面必须是green，没说后面是什么，也没说一定要出现yellow
作者: Akiii 时间: 2018-10-5 09:33
好吧。谢谢 ~~~
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