GWD19-6数学题

ruoshany

Q6:

An analyst will recommend a combination of 3 industrial stocks, 2 transportation stocks, and 2 utility stocks.  If the analyst can choose from 5 industrial stocks, 4 transportation stocks, and 3 utility stocks, how many different combinations of 7 stocks are possible?

 

A.   12

B.    19

C.   60

D.   180

E.    720

请问应该怎么算??

falconcn

=C(4,2) x C(4,2) x C(3, 2) = 10 x 6 x 3 =180