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isaaccott013
08.07.2019 •
Mathematics
Aclass committee is to be made that consists of 2 freshmen, 2 sophomores, 3 juniors, and 3 seniors. if students are being randomly chosen from groups of 12 freshmen, 17 sophomores, 16 juniors, and 20 seniors, how many possible committees can be formed?
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Ответ:
Freshmen: ₁₂C₂![\frac{12!}{2!(12 - 2)!} = \frac{12!}{2!*10!} = \frac{12 * 11 * 10!}{2*10!} = \frac{12 * 11}{2} = 6 * 11 = 66](/tpl/images/0066/7894/ad4cc.png)
Sophomore: ₁₇C₂ =![\frac{17!}{2!(17 - 2)!} = \frac{17!}{2!*15!} = \frac{17 * 16 * 15!}{2 * 15!} = \frac{17 * 16}{2} = 17 * 8 = 136](/tpl/images/0066/7894/c4bf3.png)
Juniors: ₁₆C₃ =![\frac{16!}{3!(16 - 3)!} = \frac{16!}{3!*13!} = \frac{16 * 15 * 14 * 13!}{3 * 2 * 13!} = \frac{16 * 15 * 14}{2 * 3} = 8 * 5 * 14 = 560](/tpl/images/0066/7894/9cc9d.png)
Seniors: ₂₀C₃ =![\frac{20!}{3!(20 - 3)!} = \frac{20!}{3!*17!} = \frac{20 * 19 * 18 * 17!}{3*2*17!} = \frac{20 * 19 * 18}{2 * 3} = 10 * 19 * 6 = 1140](/tpl/images/0066/7894/40dfb.png)
₁₂C₂ * ₁₇C₂ * ₁₆C₃ * ₂₀C₃
66 * 136 * 560 * 1140 = 5,730,278,400
5,730,278,400
Ответ:
Ответ:
9514 1404 393
(0, 0), (3, 5)
Step-by-step explanation:
When the graph represents direct variation, it passes through the origin (0, 0) and any points that have the same y/x ratio. Here, that ratio is 10/6 = 5/3, so points like (3, 5) and (9, 15) will be on the graph.