Multiple Choice Questions on Question In a bag there are 5 Blue 7 white and some Red balls A ball is randomly selected and the pr........... for Mathematics - All Exams Preparation

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Multiple Choice Questions

Question In a bag there are 5 Blue 7 white and some Red balls A ball is randomly selected and the pr...........

Quantitative Aptitude ( CCS) Probability
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    Question : In a bag , there are 5 Blue, 7 white and some Red balls. A ball is randomly selected and the probability that the ball is red is 2/5.

    If two balls are selected randomly, then what is the probability the selected balls are of same colour?

    47/190
    Incorrect Answer
    59/190
    Correct Answer
    13/80
    Incorrect Answer

    17/80

    Incorrect Answer
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    Explanation:

    P(balls are of same colour)=(5C2+7C2+8C2)/20C2
    =(10+21+28)/190
    =59/190.

    Hence, option 2 is the correct answer.

    By: Amit Kumar
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