[計量] 又一題計量
不好意思,再請問大家另外一題。
Column A) 20 students are participating in a drawing competition. In how many
ways can the first three and two consolation prizes be given?
Column B) 2^7 * 3^2 * 5 * 17 * 19
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答案是C
不過我算A的答案是 P(20 3)*C(17 2) = 2^6 * 3^2 * 5 * 17 * 19
因為兩個安慰獎應該是一樣的,所以用C來求...
希望大家一起幫忙算一下! 非常感謝!!!
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推
10/20 21:29, , 1F
10/20 21:29, 1F
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10/20 21:29, , 2F
10/20 21:29, 2F
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10/20 21:34, , 3F
10/20 21:34, 3F
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10/20 21:34, , 4F
10/20 21:34, 4F
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10/20 21:46, , 5F
10/20 21:46, 5F
推
10/20 21:52, , 6F
10/20 21:52, 6F
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10/20 21:57, , 7F
10/20 21:57, 7F
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10/20 22:37, , 8F
10/20 22:37, 8F
推
10/20 22:52, , 9F
10/20 22:52, 9F
推
10/20 22:57, , 10F
10/20 22:57, 10F
→
10/20 23:06, , 11F
10/20 23:06, 11F
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10/20 23:07, , 12F
10/20 23:07, 12F
→
10/20 23:13, , 13F
10/20 23:13, 13F
推
10/20 23:47, , 14F
10/20 23:47, 14F
→
10/20 23:51, , 15F
10/20 23:51, 15F
推
10/21 00:00, , 16F
10/21 00:00, 16F
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10/21 00:50, , 17F
10/21 00:50, 17F
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12/02 19:21, , 18F
12/02 19:21, 18F
→
04/13 23:51,
5年前
, 19F
04/13 23:51, 19F