There are ten cards marked with the numbers from 1 to 10 respectively. Draw two out of ten cards and never put them back. What's the probability that the sum of the two numbers on the two cards drawn is less than the average of the ten cards?
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A$$\frac{1}{10}$$
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B$$\frac{4}{15}$$
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C$$\frac{1}{25}$$
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D$$\frac{2}{35}$$
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E$$\frac{4}{45}$$
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正确答案: E