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March 24, 2017

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a sock drawer has 2 blue pair, 4 white pairs, 4 black pair. what is the probability you will pick out a white pair or blue pair? you replace each pair after your pick

i think it 4/10 im not for sure

  • math - ,

    Do you pick two? If you are trying for a matched pair, why would you replace the first one?

    There are a total of 20 socks. You can either pick white and then white, or blue and then blue. Add the two probabilities.
    (8/20)^2 + (4/20)^2
    = (2/5)^2 + (1/5)^2
    = 5/25 = 1/5

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