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.作者: EGHJUYMN 时间: 2011-3-30 19:38
C（18，4）=3060作者: huangsiyan 时间: 2011-3-31 19:59
明白了！！多谢 ~
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