Multiple Choice Questions on A box contains 6 blue 5 green and 4 red balls Two balls are drawn at random What is the probability ........... for Mathematics - All Exams Preparation

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Multiple Choice Questions

A box contains 6 blue 5 green and 4 red balls Two balls are drawn at random What is the probability ...........

Quantitative Aptitude ( CCS) Probability
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    A box contains 6 blue, 5 green and 4 red balls. Two balls are drawn at random. What is the probability that there is no red ball? 

    1/10

    Incorrect Answer

    11/21

    Correct Answer

    5/18

    Incorrect Answer

    11/23

    Incorrect Answer
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    Explanation:

    Answer & Explanation
    11/21
    Explanation: 
    Total balls = 15
    Not red means green or blue i.e. any of (5+6) = 11 balls
    So prob. = 11C2 / 15C2 = 11/21

    By: Sandeep Dubey
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