→ kairi:你第一題漏打了一項吧 10/10 17:16
→ rq654:1.二項式定理 (1+1)^99 2.(4/10)*(3/9)+(3/10)*(2/9)*2 10/10 18:16
→ prome:2.C(8,4)C(4,3)[兩女在3人組]+1/2C(8,3)C(5,3)[兩女在4人 10/10 19:29
→ prome:組]再除以1/2C(10,3)C(7,3)C(4,4) 10/10 19:29
→ prome:抱歉我算錯= = 10/10 19:41
→ prome:原來我寫對= = 10/10 19:59