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Question Number 43344 by peter frank last updated on 10/Sep/18
The number 1, 2, 3, ..., n  are arranged  in a random order. The probability  that the digits 1, 2, 3, ..., k (k>n) appears  as neighbours is
Thenumber1,2,3,,narearrangedinarandomorder.Theprobabilitythatthedigits1,2,3,,k(k>n)appearsasneighboursis
Commented by MrW3 last updated on 10/Sep/18
k<n  (((n−k+1)!k!)/(n!))
k<n(nk+1)!k!n!

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