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~~ | 
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发表于 2018-10-4 13:35:47
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