added Hat Check Problem #9
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This problem can be solved by counting the number n of derangements of an n–element set. A derangement is a permutation of a set’s elements, such that no element appears in its original position.
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This problem can be solved by counting the number n of derangements of an n–element set. A derangement is a permutation of a set’s elements, such that no element appears in its original position.