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Permutations count (Posted on 2015-10-01) Difficulty: 3 of 5
Find the number of permutations of (1,2,3...n) possessing the following feature:

The number n is the only local maximum e.g. 123465, 123564, 654321,
as opposed to 651432, 261354.

See The Solution Submitted by Ady TZIDON    
Rating: 3.0000 (1 votes)

Comments: ( Back to comment list | You must be logged in to post comments.)
Hints/Tips re: error in Comment 10 of 10 |
(In reply to error in "official solution" by Steve Herman)

It is definitely better, but not an error. Trying to make it short nothing was said about the nature of k, but it is actually not a constant number, it is k(n) which is equivalent to  f(n).

Unfortunately there is no way to correct  the official solution, and

your post is most helpful to someone who missed my intentions.

Thank you for your remark.

Edited on October 2, 2015, 9:36 pm
  Posted by Ady TZIDON on 2015-10-02 21:29:54

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