Probability based question useful for your interviews

  • 8Nov
  • 2014
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    BalajiSenior Member
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    08-11-2014, 11:50 PM #1
    The probability that at least one of the event A and B occurs is 0.6 . 
    if A and B occurs simultaneously with probability 0.2  
    then P(A')+P(B')=?

    A. 0.4
    B. 0.8
    C. 1.2
    D. 1.4


    SOLUTION 

    P(A')+P(B') = 2 - [P(A)+P(B)]

    = 2 - [0.6+0.2]
    =1.2

    SO CHOICE C IS CORRECT ANSWER

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