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题库 / Prep2007E1-DS-12
Of the 25 cars sold at a certain dealership yesterday, some had automatic transmission and some had antilock brakes. How many of the cars had automatic transmission but not antilock brakes?
(1) All of the cars that had antilock brakes also had automatic transmission.
(2) 2 of the cars had neither automatic transmission nor antilock brakes.
Statement (1) ALONE is sufficient, but statement (2) alone is not sufficient.
Statement (2) ALONE is sufficient, but statement (1) alone is not sufficient.
BOTH statements TOGETHER are sufficient, but NEITHER statement ALONE is sufficient.
EACH statement ALONE is sufficient.
Statements (1) and (2) TOGETHER are NOT sufficient.
还没有题目讲解（毕出老师会陆续发布对官方考题的解读，请保持关注）。
(1) All of the cars that had antilock brakes also had automatic transmission，没说had automatic transmission的cars是否 had antilock brakes
（1）所有有antilocks brakes的都有automatic transmission，但是还是不知道其中任何一个的数量
2 of ....只是说明有两辆，不是说只有两辆。
（1）所有有antilocks brakes的都有automatic transmission，但是还是不知道其中任何一个的数量
典型的四种情况然后一一代入
为什么我没做过这题。。系统给我显示这题我做错了？？
题目求的是 at + nab 的 数量。 1）里面讲了，if ab，则at； 2） not ab+ not at = 2
1）错；2） 也错；
1）+2），可以得知， at +ab, 以及 at + nab 为 23辆，，所以错。
套路深。。。
some had automatic transmission and some had antilock brakes. 这句话只是想说车有T/B两种装备，没有表达T、B之间没有交集。