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M - N = anggota M yang bukan merupakan anggota N
N = { 3,5,7,9,11,13,15 }
M - N = { 6,7,8,9,10,11,12,13,14 } - {3,5,7,9,11,13,15}
= { 3,5,15 }
jawab: c
maaf kalau ada yang salah.