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n(S) = n(A) + n(B) - n(AnB) + n(AuB)'
40 = 19 + 24 - 15 + n(AuB)'
40 = 28 + n(AuB)'
n(AuB)' = 40 - 28 = 12 orang
ket : n(AuB)' = yang tidak menyukai kedua-duanya
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