Multiple Choice Questions on There are 4 white balls 5 blue balls and 3 green balls in a box 2 balls are chosen at random What is........... for Mathematics - All Exams Preparation

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Multiple Choice Questions

There are 4 white balls 5 blue balls and 3 green balls in a box 2 balls are chosen at random What is...........

Quantitative Aptitude ( CCS) Probability
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    There are 4 white balls, 5 blue balls and 3 green balls in a box. 2 balls are chosen at random. What is the probability of both balls being non-blue?

    23/66

    Incorrect Answer

    5/18

    Incorrect Answer

    8/21

    Incorrect Answer

    7/22

    Correct Answer
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    Explanation:

    Both balls being non-blue means both balls are either white or green
    There are total 12 balls (4+3+5)
    and total 7 white + green balls.
    So required probability = 7C2/12C2 = [(7*6/2*1) / (12*11/2*1)] = 21/66 = 7/22

    Hence, option 4 is the correct answer.

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