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OpenStudy (anonymous):
On a party, five friends are going to give each other gifts in such a way that everybody gives one gift and receives one gift (no one should receive their own gift). In how many ways is this possible?
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OpenStudy (anonymous):
3120
OpenStudy (anonymous):
no
OpenStudy (anonymous):
24?
OpenStudy (anonymous):
no
OpenStudy (anonymous):
Why? Person 1 can give his gift to 4 different persons, Person 2 to 3 different, Person 3 to 3, Person 4 to 2 and Person 5 is set. 4! = 24
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OpenStudy (anonymous):
oops, Person 3 to 2 different, Person 4 to 1, 5 to 1
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