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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.$$\frac{4}{9}$$
C显示答案
