400-1816-180
本題由lindy提供
In a stack of cards, 9 cards are blue and
A. 10
B. 11
C. 12
D. 15
E. 18
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答案：
C
抽到的為藍(lán)
色的可能性為 C2，9
一共的可能性為C2，x
那么C2，9/C2，x=6/11
9*8/2：x（x-1）/2=6/11
72：x（x-1）=6:11
6x（x-1）=72*11
x（x-1）=12*11
所以x=12 
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