Posted by Anonymous on Wednesday, September 26, 2007 at 1:00am.
This is a permutation. I searched Google under the key words "permutations math" to get these possible sources:
http://mathforum.org/dr.math/faq/faq.comb.perm.html
http://www.regentsprep.org/Regents/math/permut/Lperm.htm
http://www.wtamu.edu/academic/anns/mps/math/mathlab/col_algebra/col_alg_tut56_perm.htm
Perhaps this information will help. Thanks for asking.
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