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Bab HimpunanMatematika SMP Kelas VII
Q = {2, 3, 5, 7, 11, 13}
n (Q) = 6
Banyak himpunan bagian yang mempunyai 2 anggota
= { (2,3), (2,5), (2, 7), (2, 11), (2, 13), (3,5), (3,7), (3,11), (3,13), (5,7), (5,11), (5,13), (7,11), (7,13), (11,13) }
= 15
atau
6C2 = 6 . 5/2
6C2 = 15
✩✩ C ✩✩