这个是17年版OG的355题,是一个DS题目,1和2的条件能不能满足x=0.
If X denotes the least integer greater than or equal to x, is x = 0?
1. -1 < x < 1
2. x < 0
A. 1 is sufficient
B. 1 is not sufficient, 2 is sufficient
C. 1 and 2 are both needed to be sufficient
D. 1 or 2 are both sufficient
E. Neither 1 nor 2 is sufficient
If X denotes the least integer greater than or equal to x, is x = 0?
我理解题意是 X指的是比x大的最小整数
x大于-1小于1 那如果x是0.5 X就是1吧
x小于0 那如果x等于-0.9 X就是0, x等于-1 X就是-1
两个加一起 x大于-1 小于0 那就只能是0