4.6.2 Exponential generating functions
4.6.2 Exponential generating functions The number of r-combinations of multiset S={n 1 ·a 1 ,n 2 ·a 2 ,…, n k ·a k } : C(r+k-1,r), generating function:. The number of r-permutation of set S={a 1 ,a 2 ,…, a k } :p(n,r), generating function:. C(n,r)=p(n,r)/r!.
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