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himpunan {2,3,4,5,6}
himpunan kosong bisa ditulis { }
himpunan kuasa ditulis n(P(A))
A gabungan B ditulis ( A U B )
misal A = { 1,2,3,4 }
B = { 5,6,7 }
maka ( A U B ) = {1,2,3,4,5} U {5,6,7}
= {1,2,3,4,5,6,7}