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A permutation puzzle (Posted on 2006-09-20) Difficulty: 3 of 5
Determine the number of permutations (p1, p2,...p7) of 1,2, ...7; such that for all k 1≤k≤6, (p1, p2,... pk) is not a permutation of (1,2, ...k); i.e., p1≠1; (p1, p2) is not a permutation of (1,2), etc.

What would be the answer if we specify 1≤k<6 instead?

No Solution Yet Submitted by K Sengupta    
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The problem is now displayed as submitted in the original form.

 

 

 

Edited on September 20, 2006, 2:19 pm
  Posted by K Sengupta on 2006-09-20 14:15:33

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