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    Subject

    Quantitative Aptitude

    Topic

    Probability

    Anamika carries a bag which contains 50 coins and each coin is marked from 51 to 100. If she picked one coin at random find the probability that the number on the coin is not a prime number.

    ক)
    1/5
    খ)
    3/5
    গ)
    2/5
    ঘ)
    4/5
    ঙ)
    None of these

    Explanation

    There are 10 prime numbers between 51 to 100: 53, 59, 61, 67, 71, 73, 79, 83, 89, 97 ∴ Probability that the number on the coin is a prime number = (10/50) = (1/5) Probability that the number on the coin is not a prime number = 1 - probability that the number on the coin is a prime number ⇒ Probability that the number on the coin is not a prime number = 1 – 1/5 = 4/5

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