Some question: 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?
Options:
(A) 12
(B) 19
(C) 60
(D) 180
(E) 720
Some stream of consciousness:
5C3 * 4C2 * 3C2 = 10*6*3 = 180. The answer: (D).