2. A derangement is a permutation TE Sn with no fixed points, i.e. none of the elements remain in their original position. How many derangements of [n] are there?
2. A derangement is a permutation TE Sn with no fixed points, i.e. none of the elements remain in their original position. How many derangements of [n] are there?
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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Combinatorics
![couples sit together?
2. A derangement is a permutation T E Sn with no fixed points, i.e. none of
the elements remain in their original position. How many derangements
of [n] are there?
A
2
PRE
55000](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2Fa14a0662-96d3-454f-9070-eb808829fccd%2F0377f0c9-8103-4015-ae03-e3df8a56ac74%2Ftjypnu_processed.jpeg&w=3840&q=75)
Transcribed Image Text:couples sit together?
2. A derangement is a permutation T E Sn with no fixed points, i.e. none of
the elements remain in their original position. How many derangements
of [n] are there?
A
2
PRE
55000
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