Answers

2015-11-24T12:12:02+08:00
I guess that's circular permutation.

P = (n-1)!
   = (12-1)!
   =11! or 11 x 10 x 9 x 8 x 7 x 6 x 5 x 4 x 3 x 2 x 1
   = 39, 916, 800
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