Combinatoricseasy
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How many ways can 5 people be partitioned into 2 groups where one group has 1 person and the other has 4?
How many ways can 5 people be partitioned into 2 groups where one group has 1 person and the other has 4?
How many ways can 5 people be partitioned into 2 groups where one group has 1 person and the other has 4?