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(2009•中山)在一个不透明的布袋中装有2个白球和n个黄球,它们除颜色不同外,...
(2009•中山)在一个不透明的布袋中装有2个白球和n个黄球,它们除颜色不同外,其余均相同.若从中随机摸出一个球,它是黄球的概率是
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,则n=
.
考点分析:
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