There are 50 balls of the same size and texture in a bag, including 20 red balls, 20 green balls, 6 purple balls and 4 black balls. The probability that a ball is selected randomly from the bag is equal. If Two balls were chosen randomly from the 50 balls in one time, what is the probability that these two balls are of the same color?
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A0.27
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B0.29
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C0.31
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D0.33
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E0.55
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正确答案: D