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n(A) = 4
baris ke-4 pada segitiga pascal adalah
1 4 6 4 1
↓ ↓ ↓ ↓ ↓
0 angg I angg II angg III angg IV angg
Himpunan bagian dg 2 anggota ada 6 yaitu
{1,2}, {1,4}, {1,7}, {2,4}, {4,7}, {2,7}