In how many ways can their hats be returned

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Reference no: EM131569777

Question: Twenty people check their hats at a theater. In how many ways can their hats be returned so that

(a) no one receives his or her own hat?

(b) at least one person receives his or her own hat?

(c) [BB] exactly one person receives his or her own hat?

(d) at least two people receive their own hats?

(e) at most two people receive their own hats?

Reference no: EM131569777

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