Multiple Choice Questions on A box contains 28 black and 35 brown balls 3 balls are drawn at random What is the probability........... for CDS Exam Preparation

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Multiple Choice Questions

A box contains 28 black and 35 brown balls 3 balls are drawn at random What is the probability...........

Quantitative Aptitude (CDS) Probability
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     A box contains 28 black and 35 brown balls. 3 balls are drawn at random. What is the probability that all are black?

     

    0.0482
     

    Incorrect Answer

    0.0284
     

    Incorrect Answer

    0.2084
     

    Incorrect Answer

    0.0824

    Correct Answer
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    Explanation:

    n (S) = Number of ways of drawing 3 balls out of 63
    = 63C3 
    = 39711
    n (E) = No. of ways of drawing 3 balls out of 28
    = 28C3 
    =3276
    P (E) =n (E)/n (S)
    =3276/39711
    =0.0824

    By: bhavesh kumar singh
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