There are 50 balls in an opaque bag. The number of red balls, orange balls, yellow balls and green balls is 20, 20, 6, and 4, respectively. Two balls will be taken out randomly at one time from the bag. What's the approximate probability that the two balls are the same color?
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A0.31
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B0.33
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C0.35
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D0.37
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E0.39
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正确答案: B