第九节排列与组合一、知识要点:1、分类记数原理: ______________________________________________________________________________________________________________________________________________2、分步记数原理:_____________________________________________________________________________________________________________________________________________3、排列:______________________________________________________________________4、组合:______________________________________________________________________5、排列数公式:(1)____________________________________________________________(2)__________________________________________________________________________(3)_________________________________________________________________________6、组合数公式:(1)__________________________________________________________________________(2)__________________________________________________________________________(3)__________________________________________________________________________7、组合数性质:(1)___________________________________________________________(2)___________________________________________________________________________(3)__________________________________________________________________________(4)___________________________________________________________________________(5)___________________________________________________________________________(6)_________________________________________________________________
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