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 and 6 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
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 and 6 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
8C4*6C3 = 8*7*6*5/4/3/2/1 * 6*5*4/3/2/1 = 1400
选C
答
从8个中选4个，从6个中选3个，共1400种，选C
答
north:8中取4,
south 6中取3,
用组合数,相乘,得1400
选C
答
C8(4)+C6(3)=90
SO CHOOSE D