Jury trials where plaintiff cases are reversed represents A ∩ B. There are 194 such cases, so: P(A ∩ B) = 194 / 2143 = 0.0905 P(AUB) = P(A) + P(B) - P(A ∩ B) = 1465/2143 + 265/2143 - 194/2143 = 0.717
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