JEE Main & Advanced Mathematics Question Bank Critical Thinking

  • question_answer
    A purse contains 4 copper coins and 3 silver coins, the second purse contains 6 copper coins and 2 silver coins. If a coin is drawn out of any purse, then the probability that it  is a copper coin  is [BIT Ranchi 1991; MNR 1984; UPSEAT 2000]

    A)                 4/7         

    B)                 3/4

    C)                 37/56     

    D)                 None of these

    Correct Answer: C

    Solution :

                    Required probability \[=\frac{1}{2}.\frac{4}{7}+\frac{1}{2}.\frac{6}{8}=\frac{37}{56}.\]


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