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【单选题】
在一个袋子中,装有4个和2个黑球,这些球除颜色外完全相同,从袋中任意摸出2个球,则两球同色的概率是(  )
A.
7 15
B.
8 15
C.
4 9
D.
5 9
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A.
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B.
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C.
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A.
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B.
rugby is the most popular sport in America
C.
basketball is the most popular sport in America
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