A bag contains 1 red, 1 yellow, 1 blue, and 1 green marble. What is the probability of choosing a green marble, not replacing it, and then choosing a red marble?

The probability of choosing the green marble first is 1/4. After it is not replaced, 3 marbles remain, and the probability of choosing the red marble next is 1/3. Multiply the probabilities: 1/4 × 1/3 = 1/12, so the correct choice is 1 over 12.

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