SAT OG 排列组合题The Acme Plumbing Company will send a team of 3
SAT OG 排列组合题
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?
看不懂也不会做……求教
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?
看不懂也不会做……求教
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你能帮帮他们吗