[機統] 拿球問題
請教一下各位大大
這題用高中數學解不出來
能不能幫忙一下Q
題目如下:
有兩顆球(一紅一白),取出來的機率分別是0.7與0.3
若現在有三顆球(兩紅一白),取出白球的機率是多少?
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