a b c d e f g 七位同学按任意次序站成一排a b c d e f g 七位同学按任意次序站成一排,试求下列时间的概率(1)事件A:a在边上 (2)事件B:a和b都在边上(3)事件C:a或b在边上(4)事件D:a和b
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![a b c d e f g 七位同学按任意次序站成一排a b c d e f g 七位同学按任意次序站成一排,试求下列时间的概率(1)事件A:a在边上 (2)事件B:a和b都在边上(3)事件C:a或b在边上(4)事件D:a和b](/uploads/image/z/10093626-18-6.jpg?t=a+b+c+d+e+f+g+%E4%B8%83%E4%BD%8D%E5%90%8C%E5%AD%A6%E6%8C%89%E4%BB%BB%E6%84%8F%E6%AC%A1%E5%BA%8F%E7%AB%99%E6%88%90%E4%B8%80%E6%8E%92a+b+c+d+e+f+g+%E4%B8%83%E4%BD%8D%E5%90%8C%E5%AD%A6%E6%8C%89%E4%BB%BB%E6%84%8F%E6%AC%A1%E5%BA%8F%E7%AB%99%E6%88%90%E4%B8%80%E6%8E%92%2C%E8%AF%95%E6%B1%82%E4%B8%8B%E5%88%97%E6%97%B6%E9%97%B4%E7%9A%84%E6%A6%82%E7%8E%87%EF%BC%881%EF%BC%89%E4%BA%8B%E4%BB%B6A%EF%BC%9Aa%E5%9C%A8%E8%BE%B9%E4%B8%8A+%EF%BC%882%EF%BC%89%E4%BA%8B%E4%BB%B6B%EF%BC%9Aa%E5%92%8Cb%E9%83%BD%E5%9C%A8%E8%BE%B9%E4%B8%8A%EF%BC%883%EF%BC%89%E4%BA%8B%E4%BB%B6C%EF%BC%9Aa%E6%88%96b%E5%9C%A8%E8%BE%B9%E4%B8%8A%EF%BC%884%EF%BC%89%E4%BA%8B%E4%BB%B6D%EF%BC%9Aa%E5%92%8Cb)
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