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A box contains 10 pairs of shoes (20 shoes in total). If two shoes are selected at random, what is the probability that they are matching shoes?
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A.$$\frac{1}{190}$$
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B.$$\frac{1}{20}$$
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C.$$\frac{1}{19}$$
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D.$$\frac{1}{10}$$
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E.$$\frac{1}{9}$$
C显示答案
