Quantitative Methods Q155

0. The probability of event A is 80%. The probability of event B is 20%. The joint probability of AB is 35%. The probability that A or B occurs or both occur is closest to:

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Option : A
Explanation : The probability that at least one of two events will occur is the sum of the probabilities of the separate events less the joint probability of the two events. P(A or B) = P(A) + P(B) – P(AB) 80% = 70% + 20% – P(AB); therefore, P(AB) = 10%.

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