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{a,c}
{a, d}
{b, c}
{b, d}
{c, d}
n(A)= 4
banyak himpunan bagian dengan 2 nggota = 4C2 = 6
atau dengan pascal ke 4
.
1,4,6,4,1 --> banyak HB 2 anggota adalah urutan ke3 = 6