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Discussion :: Probability

  1. Out of first 20 natural numbers, one number is selected at random. The probability that it is either an even number or a prime number is -.
    2. A.
    1/2
    B.
    16/19
    C.
    4/5
    D.
    17/20
    E.
    3/5

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    Answer : Option D

    Explanation :

    n(S) = 20

    n(Even no) = 10 = n(E)

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