Set K consists of all fractions of the form$${ x}\over({x+2}) $$where x is a positive even integer less than 20. What is the product of all the fractions in Set K ?
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A$$\frac{1}{20}$$
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B$$\frac{1}{10}$$
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C$$\frac{1}{9}$$
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D$$\frac{1}{2}$$
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E$$\frac{8}{9}$$
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正确答案: B