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n(D) = 4
1
1 1
1 2 1
1 3 3 1
1 4 6 4 1
↓ ↓ ↓ ↓ ↓
0 anggta 1 anggta 2 anggta 3 anggta 4 anggota
jadi yg memiliki 3 anggota sebanyak 4 himpunan:.
(a,b,c)
(a,b,d)
(a,c,d)
(b,c,d)