There are three blue balls, five green balls and two red balls in an opaque box. Two balls are taken out randomly. What is the probability that one ball is blue and the other is green?
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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$$\frac{1}{5}$$
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E$$\frac{1}{6}$$
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正确答案: B