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10th Class Mathematics Probability Question Bank Probability

  • question_answer
    In a bag, there are 12 black and 6 white balls. Two balls are chosen at random and first one is found to be black. The probability that the second one is also black is:

    A)  \[\frac{11}{17}\]          

    B)  \[\frac{12}{17}\]

    C)  \[\frac{13}{18}\]                                  

    D)  None of these

    Correct Answer: A

    Solution :

    (a) 11/17 (if the first one is black, there will be 11 black balls left out of 17)    


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