一个袋中装有黑球,白球和红球共n(n是正整数)个,这些球除颜色外相同.已知从袋里摸出一个球,得到黑...一个袋中装有黑球,白球和红球共n(n是正整数)个,这些球除颜色外相同.已知从袋里摸出
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![一个袋中装有黑球,白球和红球共n(n是正整数)个,这些球除颜色外相同.已知从袋里摸出一个球,得到黑...一个袋中装有黑球,白球和红球共n(n是正整数)个,这些球除颜色外相同.已知从袋里摸出](/uploads/image/z/8821947-3-7.jpg?t=%E4%B8%80%E4%B8%AA%E8%A2%8B%E4%B8%AD%E8%A3%85%E6%9C%89%E9%BB%91%E7%90%83%2C%E7%99%BD%E7%90%83%E5%92%8C%E7%BA%A2%E7%90%83%E5%85%B1n%28n%E6%98%AF%E6%AD%A3%E6%95%B4%E6%95%B0%EF%BC%89%E4%B8%AA%2C%E8%BF%99%E4%BA%9B%E7%90%83%E9%99%A4%E9%A2%9C%E8%89%B2%E5%A4%96%E7%9B%B8%E5%90%8C.%E5%B7%B2%E7%9F%A5%E4%BB%8E%E8%A2%8B%E9%87%8C%E6%91%B8%E5%87%BA%E4%B8%80%E4%B8%AA%E7%90%83%2C%E5%BE%97%E5%88%B0%E9%BB%91...%E4%B8%80%E4%B8%AA%E8%A2%8B%E4%B8%AD%E8%A3%85%E6%9C%89%E9%BB%91%E7%90%83%2C%E7%99%BD%E7%90%83%E5%92%8C%E7%BA%A2%E7%90%83%E5%85%B1n%28n%E6%98%AF%E6%AD%A3%E6%95%B4%E6%95%B0%EF%BC%89%E4%B8%AA%2C%E8%BF%99%E4%BA%9B%E7%90%83%E9%99%A4%E9%A2%9C%E8%89%B2%E5%A4%96%E7%9B%B8%E5%90%8C.%E5%B7%B2%E7%9F%A5%E4%BB%8E%E8%A2%8B%E9%87%8C%E6%91%B8%E5%87%BA)
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