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Banking Sample Paper IBPS PO (Main) Sample Test Paper-1

  • question_answer
    Directions: Study the following information carefully and answer the questions that follow: A bag contains 2 red balls, 3 white balls and 5 pink balls.
    If three balls are chosen at random, what is the probability that all are pink balls?

    A) \[\frac{1}{13}\]                         

    B) \[\frac{1}{12}\]             

    C) \[\frac{7}{17}\]             

    D)        \[\frac{3}{16}\]             

    E) \[\frac{2}{7}\]

    Correct Answer: B

    Solution :

    \[n(S){{=}^{10}}{{C}_{3}}\] \[n(E){{=}^{5}}{{C}_{3}}\] \[\therefore \]\[P(E)=\frac{^{5}{{C}_{3}}}{^{10}{{C}_{3}}}=\frac{10}{120}=\frac{1}{12}\]


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