[解題] 高一數學排列組合
1.年級：高一
2.科目：數學
3.章節：排列組合
4.題目：
0~9的數字排列，1 3 5 7 9按順序排列的機率是多少(可相鄰也可不相鄰)
答案1/120
5.想法：
原本是想全部排為10!當分母，分子先排2 4 6 8 0 再將13579依序插入
於是得到5!*(6+5+4+3+2)，可是因為要考慮到可相鄰跟不相鄰的
就變得好複雜，有甚麼可以比較簡單的考慮方法呢??
--
※ 發信站: 批踢踢實業坊(ptt.cc)
◆ From: 219.85.0.57
→
09/12 18:30, , 1F
09/12 18:30, 1F
推
09/12 19:15, , 2F
09/12 19:15, 2F
→
09/12 19:15, , 3F
09/12 19:15, 3F
→
09/12 19:17, , 4F
09/12 19:17, 4F
→
09/12 19:17, , 5F
09/12 19:17, 5F
→
09/12 23:11, , 6F
09/12 23:11, 6F
推
09/13 07:10, , 7F
09/13 07:10, 7F
→
09/13 16:16, , 8F
09/13 16:16, 8F
推
09/13 16:29, , 9F
09/13 16:29, 9F
→
09/13 16:29, , 10F
09/13 16:29, 10F
推
09/13 19:03, , 11F
09/13 19:03, 11F
推
09/13 22:36, , 12F
09/13 22:36, 12F
→
09/13 22:37, , 13F
09/13 22:37, 13F
→
09/14 08:04, , 14F
09/14 08:04, 14F
推
09/14 12:05, , 15F
09/14 12:05, 15F
推
09/15 01:02, , 16F
09/15 01:02, 16F
討論串 (同標題文章)