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数学概率问题?

不要抓住你们老师的一个小小错误不放,

数学概率问题?

人谁无过,过而改之,善莫大焉.

以下是所有情况,0,1,2代表三种不同作物,下面是按照数字大小顺序排列的不重不少,很好检验.共48种.

{0,1,0,1,0},

{0,1,0,1,2},

{0,1,0,2,0},

{0,1,0,2,1},

{0,1,2,0,1},

{0,1,2,0,2},

{0,1,2,1,0},

{0,1,2,1,2},

{0,2,0,1,0},

{0,2,0,1,2},

{0,2,0,2,0},

{0,2,0,2,1},

{0,2,1,0,1},

{0,2,1,0,2},

{0,2,1,2,0},

{0,2,1,2,1},

{1,0,1,0,1},

{1,0,1,0,2},

{1,0,1,2,0},

{1,0,1,2,1},

{1,0,2,0,1},

{1,0,2,0,2},

{1,0,2,1,0},

{1,0,2,1,2},

{1,2,0,1,0},

{1,2,0,1,2},

{1,2,0,2,0},

{1,2,0,2,1},

{1,2,1,0,1},

{1,2,1,0,2},

{1,2,1,2,0},

{1,2,1,2,1},

{2,0,1,0,1},

{2,0,1,0,2},

{2,0,1,2,0},

{2,0,1,2,1},

{2,0,2,0,1},

{2,0,2,0,2},

{2,0,2,1,0},

{2,0,2,1,2},

{2,1,0,1,0},

{2,1,0,1,2},

{2,1,0,2,0},

{2,1,0,2,1},

{2,1,2,0,1},

{2,1,2,0,2},

{2,1,2,1,0},

{2,1,2,1,2}

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