πŸ“’ Too many exams? Don’t know which one suits you best? Book Your Free Expert πŸ‘‰ call Now!


    ⚑ Month End Offer - Flat 52% Off On All Courses! Enroll Now ⚑
    00:00:00 AM Left

    Question

    Sita tells the truth in 80% of cases and Geeta tells the

    truth in 30% of cases. Find the probability that at least one of them tells the truth.
    A 17/20 Correct Answer Incorrect Answer
    B 12/11 Correct Answer Incorrect Answer
    C 43/50 Correct Answer Incorrect Answer
    D 20/21 Correct Answer Incorrect Answer

    Solution

    ATQ,

    Sita tells truth = 0.8

    β†’ lies = 0.2

    Geeta tells truth = 0.3

    β†’ lies = 0.7

    At least one truth:

    P = 1 – P(both lies)

    P(both lies) = 0.2 Γ— 0.7 = 0.14

    P(at least one truth) = 1 – 0.14 = 0.86 = 43/50

    Practice Next
    ask-question