] Let A be a set of n 2 2 distinct mmbers and let aja2 a, be a permutation of A. 2,3, ...,n we say that position i in the permutation is a step if a,-1< aị. We also go 5. [ For i = ahead and just consider position 1 a step. What is the expected number of steps in a random perimutation of A?

Algebra & Trigonometry with Analytic Geometry
13th Edition
ISBN:9781133382119
Author:Swokowski
Publisher:Swokowski
Chapter10: Sequences, Series, And Probability
Section10.8: Probability
Problem 30E
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5. [
] Let A be a set of n 2 2 distinct mmbers and let aja2 an be a permutation of A.
For i = 2,3, ..,n we say that position i in the permutation is a step if a,-I < aj. We also go
ahead and just consider position 1 a step. What is the expected number of steps in a random
permutation of A?
Transcribed Image Text:5. [ ] Let A be a set of n 2 2 distinct mmbers and let aja2 an be a permutation of A. For i = 2,3, ..,n we say that position i in the permutation is a step if a,-I < aj. We also go ahead and just consider position 1 a step. What is the expected number of steps in a random permutation of A?
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