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P(AuB)= = P(A)+P(B) - P(AnB)
P(AuB) - P(A) - P(B) = -P(AnB) |*(-1)
P(A) + P(B) - P(AuB) = P(AnB)
P(A\B)= P(A) - [P(A) + P(B) - P(AuB)]
P(A\B) = -P(B) + P(AuB) =