- UID
- 1333191
- 在线时间
- 小时
- 注册时间
- 2018-3-13
- 最后登录
- 1970-1-1
- 主题
- 帖子
- 性别
- 保密
|
QX: (Q143 from CD, 12/23/18 Cycle)
In an xyz coordinate system, -13 < x < 13, 11 < y < 32, and 5 ≤ z ≤ 15 where x, y, and z are integers. How many possible points of (x, y, z) are there in this coordinate system?
Answer: 5,500
Note:
13 – (-13) – 1 = 25
32 – 11 – 1 = 20
15 – 5 + 1 = 11
25*20*11 = 5,500
我朋友看到了这题!
|
|