A={1,2,3,4,5}, B={1,2,3,4,5}. Take a number from sets A and B respectively. What is the probability that the product of these two numbers is less than 4?
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A$$\frac{1}{5}$$
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B$$\frac{1}{6}$$
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C$$\frac{2}{5}$$
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D$$\frac{1}{3}$$
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E$$\frac{2}{3}$$
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正确答案: A