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Railways R.R.C. (Chennai) Solved Paper Held on 2nd Shift 9-11-2014

  • question_answer
    A box contains 5 green, 4 yellow and 3 white balls. Three balls are drawn at random. What is the probability that they are not of same colour?

    A) 52/55               

    B) 3/55

    C) 41/44               

    D) 3/44

    Correct Answer: B

    Solution :

    Required Probability \[=\frac{({{5}_{{{C}_{1}}}}+{{4}_{{{C}_{1}}}}+{{3}_{{{C}_{1}}}})}{{{12}_{{{C}_{3}}}}}\] \[\frac{=(5+4+3)}{220}=\frac{12}{220}=\frac{3}{55}\]


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