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a draw holds 5 navy socks, 7 white socks and 6 black socks. if two socks are selected at random without looking what is the probability that they do no match?

  • math -

    Ways to get 2 socks out of 18
    Ways to get 2 navy socks
    Ways to get 2 white socks
    Ways to get 2 black socks
    So ways to get two different coloured socks
    out of a total possible 153 ways.

    Calculate the probability.
    I get less than 70%.

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