SAT数学一道排列组合题求解答
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SAT数学一道排列组合题求解答
The Acme Plumbing Company will send a team of 3 plumbers to work on a certain job.The company has 4 experienced plumbers and 4 trainees.If a team consists of 1 experienced plumber and 2 trainees,how many different such teams are possible?
不知道怎么算出来的…
The Acme Plumbing Company will send a team of 3 plumbers to work on a certain job.The company has 4 experienced plumbers and 4 trainees.If a team consists of 1 experienced plumber and 2 trainees,how many different such teams are possible?
不知道怎么算出来的…
![SAT数学一道排列组合题求解答](/uploads/image/z/4181847-15-7.jpg?t=SAT%E6%95%B0%E5%AD%A6%E4%B8%80%E9%81%93%E6%8E%92%E5%88%97%E7%BB%84%E5%90%88%E9%A2%98%E6%B1%82%E8%A7%A3%E7%AD%94)
4 experienced plumbers中选1 experienced plumber,有4种可能;
4 trainees中选2 trainees,共6种可能,
4*6=24
4 trainees中选2 trainees,共6种可能,
4*6=24