A gumball dispenser has 24 gumballs, 12 white and 12 black, which are dispensed at random. If the first 3 gumballs dispensed are black, what is the probability that the next gumball dispensed will be black?
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A$$\frac{1}{2}$$
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B$$\frac{1}{3}$$
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C$$\frac{1}{4}$$
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D$$\frac{3}{7}$$
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E$$\frac{3}{8}$$
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正确答案: D