[中學] 排列組合
x1~x5為0~9的整數
(1)求滿足x1<=x2<=x3<=x4<=x5有多少組解
(2)滿足x1+x2+x3+x4+x5=15有多少解?
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02/22 00:34, , 1F
02/22 00:34, 1F
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02/22 00:35, , 2F
02/22 00:35, 2F
推
02/22 00:35, , 3F
02/22 00:35, 3F
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02/22 00:37, , 4F
02/22 00:37, 4F
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02/22 00:37, , 5F
02/22 00:37, 5F
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02/22 00:38, , 6F
02/22 00:38, 6F
推
02/22 00:39, , 7F
02/22 00:39, 7F
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02/22 00:40, , 8F
02/22 00:40, 8F
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02/22 00:41, , 9F
02/22 00:41, 9F
推
02/22 00:45, , 10F
02/22 00:45, 10F
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08/13 17:28, , 11F
08/13 17:28, 11F
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09/17 15:21, , 12F
09/17 15:21, 12F
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11/10 11:27, , 13F
11/10 11:27, 13F
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01/02 15:17,
7年前
, 14F
01/02 15:17, 14F
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07/07 10:40,
6年前
, 15F
07/07 10:40, 15F
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