GMAT Problem Solving
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Source: GWD
Level: 0
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 . What is the number of cards in the stack?
- A 10
- B 11
- C 12
- D 15
- E 18