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Banking Quantitative Aptitude Sample Paper Quantitative Aptitude Sample Paper-2

  • question_answer
    A bag contains 5 red and 8 black balls. Two balls of three balls each are made, the ball being replaced after the first draw. What is the chance that the balls were red in the first draw and black in the second?

    A)  \[\frac{140}{20449}\]

    B)  \[\frac{141}{20448}\]

    C)  \[\frac{199}{20444}\]

    D)  \[\frac{142}{21449}\]

    E)  None of these

    Correct Answer: A

    Solution :

    [a]Requiredprobability\[=\,\,\frac{{}^{5}{{C}_{3}}}{{}^{13}{{C}_{3}}}\times \frac{{}^{8}{{C}_{3}}}{{}^{13}{{C}_{3}}}=\,\,\frac{140}{20449}\]


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