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(2009•洞头县一模)一个布袋里装有红与黑两种只有颜色不同的球,已知红球有2个...
(2009•洞头县一模)一个布袋里装有红与黑两种只有颜色不同的球,已知红球有2个,且从布袋里摸出1个红球的概率是0.2,那么布袋里的黑球有 个.
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