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（本小题满分12分）一个口袋内装有形状、大小相同的2个和3个黑球。 （1）从中随机地摸出一个球不放回，再随机地摸出一个球，求两球同时是黑球的概率； （2）从中随机地摸出一个球，放回后再随机地摸出一个球，求两球颜色恰好不同的概率
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