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20 August, 00:30

Events A and B are mutually exclusive. Also, P (A) = 0.25 and P (B) = 0.35. What is P (A or B) ?

A. 0.1

B. 0.25

C. 0.35

D. 0.6

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Answers (1)
  1. 20 August, 00:54
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    The answer is D. 0.6

    P (A or B) = P (A) + P (B) - P (A and B)

    When the events are mutually exclusive, that means they cannot occur together:

    P (A and B) is empty set, thus = 0

    P (A) = 0.25

    P (B) = 0.35

    P (A or B) = 0.25 + 0.35 - 0 = 0.6
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