古典概型从含有两件正品a1 a2和一件次品B的3件产品中每次任取一件.每次取后不放回.连续任取两次,求恰好一件次品的概率.参考答案是,(a1,a2)(a1,b)(a2,b) PA=2/3 但是我老师说用(a1,a2)(a1,b)(a2,
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![古典概型从含有两件正品a1 a2和一件次品B的3件产品中每次任取一件.每次取后不放回.连续任取两次,求恰好一件次品的概率.参考答案是,(a1,a2)(a1,b)(a2,b) PA=2/3 但是我老师说用(a1,a2)(a1,b)(a2,](/uploads/image/z/3786989-5-9.jpg?t=%E5%8F%A4%E5%85%B8%E6%A6%82%E5%9E%8B%E4%BB%8E%E5%90%AB%E6%9C%89%E4%B8%A4%E4%BB%B6%E6%AD%A3%E5%93%81a1+a2%E5%92%8C%E4%B8%80%E4%BB%B6%E6%AC%A1%E5%93%81B%E7%9A%843%E4%BB%B6%E4%BA%A7%E5%93%81%E4%B8%AD%E6%AF%8F%E6%AC%A1%E4%BB%BB%E5%8F%96%E4%B8%80%E4%BB%B6.%E6%AF%8F%E6%AC%A1%E5%8F%96%E5%90%8E%E4%B8%8D%E6%94%BE%E5%9B%9E.%E8%BF%9E%E7%BB%AD%E4%BB%BB%E5%8F%96%E4%B8%A4%E6%AC%A1%2C%E6%B1%82%E6%81%B0%E5%A5%BD%E4%B8%80%E4%BB%B6%E6%AC%A1%E5%93%81%E7%9A%84%E6%A6%82%E7%8E%87.%E5%8F%82%E8%80%83%E7%AD%94%E6%A1%88%E6%98%AF%2C%EF%BC%88a1%2Ca2%EF%BC%89%28a1%2Cb%29%28a2%2Cb%29+PA%3D2%2F3+%E4%BD%86%E6%98%AF%E6%88%91%E8%80%81%E5%B8%88%E8%AF%B4%E7%94%A8%EF%BC%88a1%2Ca2%EF%BC%89%28a1%2Cb%29%28a2%2C)
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