[中學] 排列組合問題
問題如下: 2白球3黑球4紅球,要將白球先取完,請問有幾種取法?
我的作業就剩下這一題不會了,拜託大家幫我一下,謝謝
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◆ From: 114.38.0.175
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03/26 18:19, , 1F
03/26 18:19, 1F
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03/26 18:20, , 2F
03/26 18:20, 2F
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03/26 18:21, , 3F
03/26 18:21, 3F
推
03/26 19:39, , 4F
03/26 19:39, 4F
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03/26 19:41, , 5F
03/26 19:41, 5F
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03/26 19:57, , 6F
03/26 19:57, 6F
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03/26 19:57, , 7F
03/26 19:57, 7F
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03/26 19:57, , 8F
03/26 19:57, 8F
推
03/26 20:52, , 9F
03/26 20:52, 9F
推
03/26 20:55, , 10F
03/26 20:55, 10F
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03/26 20:55, , 11F
03/26 20:55, 11F
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03/26 20:55, , 12F
03/26 20:55, 12F
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03/26 22:36, , 13F
03/26 22:36, 13F
推
03/26 23:29, , 14F
03/26 23:29, 14F
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03/26 23:39, , 15F
03/26 23:39, 15F
推
03/27 01:06, , 16F
03/27 01:06, 16F
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03/27 02:02, , 17F
03/27 02:02, 17F
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08/13 16:44, , 18F
08/13 16:44, 18F
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09/17 14:41, , 19F
09/17 14:41, 19F
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