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Quiz: Probability

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Number of Questions: 27

Question: 26 -

There are 3 red balls, 4 green balls, and 5 black balls in a basket. The probability of not getting the red balls is

Options:

  1. 3/4

  2. 1/4

  3. 5/12

  4. 1/3

    5. Answer:

    3/4
    Solution:

    Total number of balls all together = 3 + 4 + 5 = 12

    Total number of red balls = 3

    Total number of green balls = 4

    Total number of black balls = 5

    Now, the total number of non-red balls = 9

    P (E) = Total number of non-red balls/Total number of balls

    = 9/12 = 3/4.

    Hence, the total number of non-red balls is 3/4.

Question: 27 -

Find out the probability of a selected number is a multiple of 3 from the numbers 1, 2, 3, 4, 5, 6, ……14, 15, 16, 17, 18.

Options:

  1. 5/13

  2. 1/6

  3. 1/5

  4. 1/3 

    5. Answer:

    1/3 
    Solution:

    Sample Space = 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18

    Multiples of 3 from the sample space = 3, 6, 9, 12, 15, 18

    P (E) = Number multiple of 3/Total numbers given in the sample space

    = 6/18 = 1/3

    Hence, a multiple of 3 from the numbers is 1/3.