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Banking Sample Paper RRB Officer (Main) Sample Test Paper-1

  • question_answer
    There are 7 blue balls, 2 orange balls and 3 pink balls in a bag. 3 balls are chosen at random. What is the probability of their being 2 blue and 1 pink balls?

    A) \[\frac{43}{220}\]                     

    B) \[\frac{63}{220}\]                     

    C)        \[\frac{43}{110}\]                     

    D)        \[\frac{1}{11}\]

    E) \[\frac{2}{23}\]

    Correct Answer: B

    Solution :

    Total no, of events in sample space \[=n(S){{=}^{12}}{{C}_{3}}=220\]             \[n(E){{=}^{7}}{{C}_{2}}{{\times }^{3}}{{C}_{1}}=63\] \[\therefore \]      \[P(E)=\frac{n(E)}{n(S)}=\frac{63}{220}\]


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