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Multiple Choice Questions

Tickets numbered 1 to 20 are mixed up and then a ticket is drawn at random What is the probability t...........

Quantitative Aptitude ( CCS) Probability
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    Tickets numbered 1 to 20 are mixed up and then a ticket is drawn at random. What is the probability that the ticket drawn has a number which is a multiple of 3 or 5?

    1/2

    Incorrect Answer

    3/5

    Incorrect Answer

    9/20

    Correct Answer

    8/15

    Incorrect Answer
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    Explanation:

    Here, S = {1, 2, 3, 4, ...., 19, 20}.

    Let E = event of getting a multiple of 3 or 5 = {3, 6 , 9, 12, 15, 18, 5, 10, 20}.

    P(E) = n(E)/n(S) = 9/20.

    Hence, option 3 is the correct answer.

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