Multiple Choice Questions on The ratio of the number of girls to the number of boys is the 5 2 in a class of 21 students A group ........... for Mathematics - All Exams Preparation

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Multiple Choice Questions

The ratio of the number of girls to the number of boys is the 5 2 in a class of 21 students A group ...........

Quantitative Aptitude ( CCS) Probability
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    The ratio of the number of girls to the number of boys is the 5 : 2 in a class of 21 students. A group of three students is to to be selected at random amongst them. What is the probability that the selected group of students contain one boy and two girls?

    45/266

    Correct Answer

    32/343

    Incorrect Answer

    120/217

    Incorrect Answer

    46/267

    Incorrect Answer
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    Explanation:

    Answer & Explanation
    Answer – 45/266
    Explanation :
    5:2 = 15+6 = 21
    n(S) = 21C3 = 1330
    n(E) = 15C1 × 6C2 = 15 × 15 = 225
    P = 225/1330 = 45/266

    By: Sandeep Dubey
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