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n(A) = 11
n(B) = 10
n(AUB) = n(A) + n(B) - n(AnB)
n(AnB) = n(A) + n(B) - n(AuB)
= 11 +10 -18
= 3
persentasenya = 3/20 x 100% = 15 persen (Jawab A)