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

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