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JEE Main & Advanced Mathematics Probability Question Bank Definition of probability

  • question_answer
    A bag x contains 3 white balls and 2 black balls and another bag y contains 2 white balls and 4 black balls. A bag and a ball out of it are picked at random. The probability that the ball is white, is                                              [IIT 1971]

    A)                 3/5         

    B)                 7/15

    C)                 1/2         

    D)                 None of these

    Correct Answer: B

    Solution :

                    Required probability \[=\frac{1}{2}\left( \frac{3}{5}+\frac{2}{6} \right)=\frac{9+5}{30}=\frac{7}{15}.\]


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