Let d₂(n) be equal to the number of permutations of n that contain no fixed points or transpositions (cycles of length 2). (a) Find a recursive formula for d₂ (n).
Let d₂(n) be equal to the number of permutations of n that contain no fixed points or transpositions (cycles of length 2). (a) Find a recursive formula for d₂ (n).
Advanced Engineering Mathematics
10th Edition
ISBN:9780470458365
Author:Erwin Kreyszig
Publisher:Erwin Kreyszig
Chapter2: Second-order Linear Odes
Section: Chapter Questions
Problem 1RQ
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Transcribed Image Text:Let d₂(n) be equal to the number of permutations of n that contain no fixed points or transpositions
(cycles of length 2).
(a) Find a recursive formula for d₂(n).
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