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| For n>=2,we note Pn the number of permutations ¦Ò of the set {1,2,¡,n} such that there is a single integer i¡Ê{1,2,¡,n-1}such that ¦Ò(i)>¦Ò(i+1).Find Pn. |
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ji_sir
Ìú¸Ëľ³æ (СÓÐÃûÆø)
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- ½ð±Ò: 12809
- Ìû×Ó: 213
- ÔÚÏß: 33.3Сʱ
- ³æºÅ: 201989
- ×¢²á: 2006-02-28
- רҵ: ÊýÂÛ
4Â¥2006-11-05 13:32:57
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