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Verified answer
K={3,4,5,6,7,8}2 anggota
K={(3,4)(3,5)(3,6)(3,7)(3,8)(4,5)(4,6)(4,7)(4,8)(5,6)(5,7)(5,8)(6,7)(6,8)(7,8)}
jadi banyak himpunan bagian K yang memiliki 2 anggota adalah
•B.15