Book: A Course in Enumeration. Author: Martin Aigner Chapter 1 Page:29 S(n) is the set of all permutations of {1, 2, ....

Question

Question

Book: A Course in Enumeration. Author: Martin Aigner

Chapter 1 Page:29

1.38 What is the expected number of fixed points when all n! permut:a tions of S(n) are equally likely?

S(n) is the set of all permutations of {1, 2, . . . ,n}.

Answer 1

Answer #1

Solution which defines a unique Permu atim-ที่ be -H a number σ,raint in the fermuta-tim Sn oY We Pind out the expected vau

Answer 2

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