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Penjelasan
A) {x|x < 13,x ∈ bilangan ganjil}
∈ bilangan ganjil < 13 seharusnya {3, 5, 7, 9, 11, 13}
B) {x|x < 15,x ∈ bilangan ganjil}
∈ bilangan ganjil < 15 seharusnya {3, 5, 7, 9, 11, 13, 15}
C) {x|x < 13,x ∈ bilangan prima}
∈ bilangan prima < 13 seharusnya {2, 3, 5, 7, 11}
D) {x|x < 15,x ∈ bilangan prima}
∈ bilangan prima < 15 = {2, 3, 5, 7, 11, 13}