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Verified answer
Mapel : MatematikaBab : Himpunan
{x < 5,x himp bilangan Asli}
A = {1,2,3,4}
2 anggota :
{(1,2),(1,3),(1,4),(2,3),(2,4),(3,4)}
n(A) = 6 Himpunan
atau cara cepatnya
4C2