- 注册
- 2005-01-17
- 消息
- 2,179
- 荣誉分数
- 85
- 声望点数
- 0
这是今天数学竞赛里面的题目.......
In the diagram, the grid has 150 rows and 150 columns, numbered from 1 to 150. In row 1, every box is shaded. In row 2, every second box is shaded. In row 3, every third box is shaded. The shading continues in this way, so that every nth box in row n is shaded. Which column has the greatest number of shaded boxes?
a) 144 b) 120 c) 150 d) 96 e) 1000
大家想想咯......
In the diagram, the grid has 150 rows and 150 columns, numbered from 1 to 150. In row 1, every box is shaded. In row 2, every second box is shaded. In row 3, every third box is shaded. The shading continues in this way, so that every nth box in row n is shaded. Which column has the greatest number of shaded boxes?
a) 144 b) 120 c) 150 d) 96 e) 1000
大家想想咯......
