1. If a and b are integers, is b even?
(1)
(2)
我选E，可答案是C，不懂是为什么？
2. When tossed, a certain coin has equal probability of landing on either side. If the coin is tossed 3 times, what is the probability that it will land on the same side each time? A.1/8 B. 1/4 C. 1/3 D.3/8 E.1/2 3. If xyz (1) │y + z│ = │y│ + │z│ (2) 4. What is the median number of employees assigned per project for the projects at Company Z? (1) 25 percent of the projects at Company Z have 4 or more employees assigned to each project. (2) 35 percent of the projects at Company Z have 2 or fewer employees assigned to each project. 这题我选E，可答案说是C，为什么？ If xyz (1) │y + z│ = │y│ + │z│ (2) 4. What is the median number of employees assigned per project for the projects at Company Z? (1) 25 percent of the projects at Company Z have 4 or more employees assigned to each project. (2) 35 percent of the projects at Company Z have 2 or fewer employees assigned to each project. 这题我选E，可答案说是C，为什么？
≠ 0, is x (y + z) ≥ 0?
│x + y│ = │x│ + │y│
≠ 0, is x (y + z) ≥ 0?
│x + y│ = │x│ + │y│
When tossed, a certain coin has equal probability of landing on either side. If the coin is tossed 3 times, what is the probability that it will land on the same side each time? A.1/8 B. 1/4 C. 1/3 D.3/8 E.1/2
3. If xyz (1) │y + z│ = │y│ + │z│ (2) 4. What is the median number of employees assigned per project for the projects at Company Z? (1) 25 percent of the projects at Company Z have 4 or more employees assigned to each project. (2) 35 percent of the projects at Company Z have 2 or fewer employees assigned to each project. 这题我选E，可答案说是C，为什么？
≠ 0, is x (y + z) ≥ 0?
│x + y│ = │x│ + │y│
If xyz
≠ 0, is x (y + z) ≥ 0?
(1) │y + z│ = │y│ + │z│
(2)
│x + y│ = │x│ + │y│
4.
What is the median number of employees assigned per project for the projects at Company Z?
(1) 25 percent of the projects at Company Z have 4 or more employees assigned to each project.
(2) 35 percent of the projects at Company Z have 2 or fewer employees assigned to each project.
这题我选E，可答案说是C，为什么？
一起来讨论吧。我的思路如下：
1。选C 因为（1）只能推出a是偶数，(2)a和b都不能确定
（1）+（2）连个条件和起来，可推出（3a+5b）-（3a+4b）=b 偶数-偶数，当然还是偶数
2。连续三次都是一个面，有两种可能，正或反，每种概率都是1/8，所以答案是1/4，选B
3。条件（1）可推出y和z同号，（2）可推出x和y同号，（1）+（2）可推出x,y,z同号，x和y+z同号，积必然大于0
4。（1）说25%的工程要4个或4个人以上去做 （2）说35%的工程要2个或少于2个人去做
（1）+（2）可推出，40%的工程需要3个人去做。一个工程按100%算的话，median number 在那个50%的位置。所以，选C
有不对的地方，欢迎指出来，谢谢：）
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