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Karena A dan B kejadian saling bebas, P(A∩B)=0
P(A) + P(B) - 0 = P(A∪B)
P(A) + 1/2 = 3/4
P(A) = 3/4 - 1/2
P(A) = 3/4 - 2/4
P(A) = 1/4