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March 25, 2017

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a sock drawer has 2 blue pair,4 white pair,4 black pair? what is the probability you will pick out a black pair ?


i think is 2/10 that how i get my answer but not for sure that correct

  • math - ,

    depends if the socks are bundled in pairs or as singles.

    If in pairs, ...
    you have 10 pairs of which 4 are black, you want to pick one black pair.
    prob = 4/10 or 2/5

    if they are singles, ...
    you have 8 black, 8 white, and 4 blue socks for a total of 20 socks.
    you want 2 consecutive blacks
    prob = 8/20 x 7/19 = 56/380 = 14/95

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