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P(B) = 1/4
P(A∨B) = 5/6
P(A∨B) = P(A) + P(B) - P(A∧B) wzór na prawd. sumy zdarzeń i przekształcamy:
P(A∧B) = P(A) + P(B) - P(A∨B) = 2/3 + 1/4 - 5/6 = 8/12 + 3/12 - 10/12 = 1/12
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