how many partiotions are there for the set {1,2,3,4} and what are they?

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how many partiotions are there for the set {1,2,3,4} and what are they?

2007-09-10 16:34:33 · 1 answers · asked by deepu 1 in Science & Mathematics ➔ Mathematics

1 answers

There are 15 partitions:

{{1, 2, 3, 4}}
{{1}, {2, 3, 4}}
{{2}, {1, 3, 4}}
{{3}, {2, 3, 4}}
{{4}, {1, 2, 3}}
{{1, 2}, {3, 4}}
{{1, 3}, {2, 4}}
{{1, 4}, {2, 3}}
{{1, 2}, {3}, {4}}
{{1, 3}, {2}, {4}}
{{1, 4}, {2}, {3}}
{{2, 3}, {1}, {4}}
{{2, 4}, {1}, {3}}
{{3, 4}, {1}, {2}}
{{1}, {2}, {3}, {4}}

2007-09-10 16:44:34 · answer #1 · answered by Scarlet Manuka 7 · 0⤊ 0⤋