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JEE Main & Advanced Mathematics Probability Question Bank Self Evaluation Test - Probability-I

  • question_answer
    A coin is tossed. If a head is observed, a number is randomly selected form the se {1, 2, 3} and if a tail is observed, a number is randomly selected from the set {2, 3, 4, 5}. If the selected number be denoted by X, what is the probability that X=3?

    A) 2/7

    B) 1/5

    C) 1/6

    D) 7/24

    Correct Answer: D

    Solution :

    [d] Probability that \[(X=3)\] \[=\frac{1}{2}\times \frac{1}{3}+\frac{1}{2}\times \frac{1}{4}=\frac{7}{24}\]


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