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June 2, 2011 4:38 am at 4:38 am
#949534
am yisrael chai
Participant
44- the number of derangements of 5 items (44 permutations where none of the elements appear in their original position)
***TRY IT! IT’S FUN!***
HINT:
9 is the number of derangements of 4 items ABC&D:
BADC, BCDA, BDAC,
CADB, CDAB, CDBA,
DABC, DCAB, DCBA
(all other permutations result in at least one in the original position)