There are 50 balls in an opaque bag. The numbers of black balls, white balls, red balls and blue balls are 20, 20, 6, and 4, respectively. If two balls are randomly taken out, what is the probability that the two balls have the same color?
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A0.30
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B0.31
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C0.32
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D0.33
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E0.34
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正确答案: D