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版选修2_3.ppt

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第一章 计数原理,12 排列与组合 12.1 排 列 第1课时 排列与排列数公式,第一章 计数原理,一定的顺序,完全相同,排列顺序,不同排列,n(n1)(n2)(n,m1),n！,1,

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