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口袋内有100个大小相同的红球、白球和黑球,其中有45个红球,从中摸出1个球,摸...
口袋内有100个大小相同的红球、白球和黑球,其中有45个红球,从中摸出1个球,摸出白球的概率为0.23,则摸出黑球的概率为 .
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