Mark SIX

🎓 學業台教學

[匿名]

2011-03-28 6:35 pm

我買9個字複式,中了4個字,有幾多注中4個字,幾多注中3個字,THX

更新1:

U are right,But I can't understand how to calculate 幾多注中3個字.Anyway,Thx your answer :>

更新2:

Thx. 如果中了5個字,是不是這樣計 5個字=4C1=4注 4個字=5C4X4C2=30注 3個字=5C3X4C3=10X4=40注 THX

回答 (1)

用戶2053

2011-03-29 3:01 am

✔ 最佳答案

4個字 : (9 - 4) C (6 - 4) = 5C2 = 10 注3個字 :(4C3) * [ (9 - 4) C (6 - 3) ] = 4 * 10 = 40 注

2011-03-29 13:23:04 補充：
Let 123456789 be nine no.
1234 are bingo.

3個字 :

123 + ??? , ??? are three no. out of five no. 56789 , 5C3 注 = 10 注
124 + ??? , 10 注
134 + ??? , 10 注
234 + ??? , 10 注

Total 40 注3個字

2011-03-30 14:03:40 補充：
Yes!
You get it!

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