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- 精华
- 0
- 积分
- 2960
- 经验
- 2960 点
- 威望
- 295 点
- 金钱
- 295 ￥
- 魅力
- 295
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求助请教！！
又错了一道Prep!!! 可能没救了.....
A certain company has 18 equally qualified applicants for 4 open positions. How many different groups of 4 applicants can be chosen by the company to fill the position if the order of selection does not matter?
答案是3060. 请高手指教为什么...... 多谢！！！！！
沮丧. |
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