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SPM – MCQ 105 – Probability of mutually exclusive events

16 July 2011

The events A and B are mutually exclusive, so:
A. Prob (A or B) = Prob (A) + Prob (B)
B. Prob (A and B) = Prob (A) * Prob (B)
C. Prob (A) = Prob (B)
D. Prob (A) + Prob (B) = 1

Correct answer : A. Prob (A or B) = Prob (A) + Prob (B)

In mutually exclusive events, the probability of at least one of them occurring will be equal to the sum of their individual probabilities.

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