If points A and B are randomly placed on the circumference of a circle with radius 2, what is the probability that the length of chord AB is greater than 2?
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A$$\frac{1}{4}$$
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B$$\frac{1}{3}$$
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C$$\frac{1}{2}$$
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D$$\frac{2}{3}$$
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E$$\frac{3}{4}$$
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正确答案: D