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A company has 13 employees,8 of whom belong to the union..

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A company has 13 employees,8 of whom belong to the union..
A company has 13 employees,8 of whom belong to the union.If 5 people work any one shift,and the union contract specifies that at least 4 union members work each shift,then how many different combinations of employees might work any given shift?
a) 10 b) 231 c) 336 d) 350 e) 406
A company has 13 employees,8 of whom belong to the union..
8选4乘5选1
=8*7*6*5/(4*3*2*1)*5
结果350