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47, af P(AUB) = 0.8 site P( A B) = 0.3 a...

47, af P(AUB) = 0.8 site P( A B) = 0.3 a P(A) + P(B) = (A) 0.3 (B) 0.5 (C) 0.7 (D) 0.9

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