![](https://cache.ptt.cc/c/https/i.imgur.com/MR7krd8l.jpg?e=1718694141&s=EGmsWLtsL16n8VKHsmFVrg)
→ sss86925 : 答案沒錯嗎 04/06 23:07
推 mtoao0122 : 1.C(9,2)*C(6,2) 04/07 00:38
→ mtoao0122 : 2.C(3,2)*C(2,1)*C(3,2)*C(4,1) 04/07 00:38
→ mtoao0122 : 更正,應該是C(3,1)*C(2,1)*C(3,1)*C(4,1) 04/07 00:41
→ mtoao0122 : 覺得答案有錯+1 04/07 00:42
→ sss86925 : m大的想法與我相同 04/07 00:43