A box contains 6 black balls and 4 white balls. If two balls are selected at random without replacement, what is the probability that both balls are white?
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A$$\frac{7}{90}$$
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B$$\frac{3}{25}$$
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C$$\frac{2}{15}$$
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D$$\frac{4}{25}$$
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E$$\frac{4}{9}$$
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正确答案: C