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11th Class Mathematics Sample Paper Mathematics Olympiad - Sample Paper-6

  • question_answer
    A bag contains 5 brown and 4 white socks. A man pulls out two socks. The probability that they are of the same colour is:

    A)  \[\frac{5}{18}\]                        

    B)  \[\frac{4}{9}\]             

    C)  \[\frac{5}{9}\]                         

    D)  \[\frac{7}{9}\]

    Correct Answer: D

    Solution :

    [d] \[\because \] Total no. of socks\[=5+4=9\]. Required probability \[=\frac{^{5}{{C}_{2}}{{+}^{4}}{{C}_{2}}}{^{9}{{C}_{2}}}\]


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