New Enroll here to Join NaBFID Analyst Into Class on May 6

    Question

    A speaks the truth 5 out of 7 times and B speaks truth 8

    out of 9 times. What is the probability that they contradict each other in stating the same fact?
    A 12/74 Correct Answer Incorrect Answer
    B 13/77 Correct Answer Incorrect Answer
    C 13/46 Correct Answer Incorrect Answer
    D 13/63 Correct Answer Incorrect Answer

    Solution

    ATQ, Probability that A speak Truth, P(A) = (5/))) Probability that B speak Truth, P(B) = (8/9) Probability that A and B lie is P(A) lies=1/7   P(B) lies=1/9 Required probability  = P(A)×P(B)+P(A)×P(B) = {[(5/7) × (1/9)] + [(1/7) × (8/9)]]} =  (5/63) + (8/63) =  13/63

    Practice Next