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n(V) = 26
n(B) = 27
n(V ∪ B)' = 4
x = gemar kedua-duanya
n(S) = n(V) + n(B) - x + n(V∪B)'
45 = 26 + 27 - x + 4
45 = 57 - x
x = 57 - 45
x = 12
jadi banyak siswa yg gemar kedua-duanya adalah 12 orang