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Define a derangement

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Reference no: EM131573901

Question: a) Define a derangement.

b) Why is counting the number of ways a hatcheck person can return hats to n people, so that no one receives the correct hat, the same as counting the number of derangements of n objects?

c) Explain how to count the number of derangements of n objects.

Reference no: EM131573901

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