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求教一个数学问题
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| For n>=2,we note Pn the number of permutations σ of the set {1,2,…,n} such that there is a single integer i∈{1,2,…,n-1}such that σ(i)>σ(i+1).Find Pn. |
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2楼2006-11-03 22:53:59
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