高中数学题,关于概率与统计的,急需答案!
问题描述：
高中数学题,关于概率与统计的,急需答案!
A real estate company with 8 employees in their north office and6 in their south office is planning to lay off 7 employees.If they decide to lay off 4 employees from the north office and 3 from the south office, in how many ways can this be done?
a)12 ways b)48 ways c)1400 ways d)none of these
答
north:8中取4,
south 6中取3,
用组合数,相乘,得1400
选C