题目信息
In a stack of cards, 9 cards are blue and the rest are red. If 2 cards are to be chosen at random from the stack without replacement, the probability that the cards chosen will both be blue is $$\frac{6}{11}$$. What is the number of cards in the stack?
A:10
B:11
C:12
D:15
E:18
参考答案及共享解析

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已选答案:
正确答案:
C:12
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