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a) P(B) = 30/75
b)P(¬A) = (10+30+15)/75 = 55/75
c)P(R ∨ B ∨ A) = (10+30+20)/75 = 60/75
d)P(¬R ∨ ¬A) = P(B ∨ N) = (30+15)/75 = 45/75