Q37 of 43 Page 15

Given P(A) = and P(B) = , find P(A or B) if A and B are mutually exclusive events.


Since A and B are mutually exclusive events

So P(A ∩ B) = P(φ ) = 0

Hence P(A ∪ B) = P(A) + P(B)

or P(A or B) =

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35
(ii) P(A) = 0.5, P(B) = 0.4, P(A ∪ B) = 0.8

36
(iii) 0.5                                  0.35

38
(ii) P(not E and not F).

39
(iii) P(A or B)