Multiple Choice Questions on In a group of 14 boys and x number of girls the probability of choosing a girl is 3 5 If we have to ........... for Mathematics - All Exams Preparation

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Multiple Choice Questions

In a group of 14 boys and x number of girls the probability of choosing a girl is 3 5 If we have to ...........

Quantitative Aptitude ( CCS) Probability
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    In a group of 14 boys and x number of girls, the probability of choosing a girl is 3/5. If we have to select two students, find the probability that atleast one of them is boy.

    12/17
    Incorrect Answer
    5/9
    Incorrect Answer
    10/13
    Incorrect Answer

    11/17

    Correct Answer
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    Explanation:

    Probability of choosing a girl = 3/5 x/(14+x) = 3/5
    => x = 21
    Required Probability = [14C1 * 21C1 + 14C2]/(14+21)C2
    = 11/17

    Hence, option 4 is the correct answer.

    By: Amit Kumar
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