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Neighboring strangers (Posted on 2012-09-24) Difficulty: 1 of 5
There are 26 letters in the English alphabet.
How many strings of length n, such that no letter
is repeated twice (or more) in succession, exist?

Examples: for n=4 agir and psop are "permitted", while aggr or ppso are not.

See The Solution Submitted by Ady TZIDON    
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answer Comment 1 of 1
I believe the answer is
26*25(n - 1)
  Posted by Dej Mar on 2012-09-24 18:03:51
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