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题库 / Prep2007E1-PS-124
Of the 12 temporary employees in a certain company, 4 will be hired as permanent employees. If 5 of the 12 temporary employees are women, how many of the possible groups of 4 temporary employees consist of 3 women and1 man?
22
35
56
70
105
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12个临时工
4个会被确认为常用工。
12个里面5个women,那就是7个men
临时工里面选4个，是3women,1man的可能
C(5,3)*C(7,1)=70