A certain company has 18 equally qualified applicants for 4 open positions. How many different groups of 4 applicants can be chosen by the company to fill the positions if the order of selection does not matter? (A) 18 (B) 72 (C) 180 (D) 1,260 (E) 3,060
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发表于 2011-7-17 09:59:39
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