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?
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total =4
red = green = blue = yellow = 1
for green = 1/4
then for red = 1/3
total probability 1/4 × 1/3 = 1/12
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