There are twenty-six cards, in which six cards with the letter C, and the rest with the letter O. Two cards were chosen randomly from these 26 cards. What's the probability that one letter is C and the other is O?
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A$$\frac{22}{61}$$
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B$$\frac{23}{64}$$
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C$$\frac{24}{65}$$
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D$$\frac{27}{70}$$
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E$$\frac{29}{72}$$
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正确答案: C