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Permutations count (Posted on 2015-10-01)

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)

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one general remark

| Comment 7 of 10 |

Both approaches are isomorphic with 2 ways to interpret the contents of the (n-1) th row of Pascal triangle.

Posted by Ady TZIDON on 2015-10-02 13:16:01

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