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Math Help - fancy some toast?

  1. #1
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    fancy some toast?

    A carton contains 12 toasters, 3 of which are defective. If four toasters
    are sold at random, find the probability that exactly one will be
    defective.?
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  2. #2
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    If an urn contains three red balls and nine blue balls and we select four of those balls the probability of getting exactly one red ball is:
    \frac{3\binom{9}{3}}{\binom{12}{4}}.
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  3. #3
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    hello tx for your help plato

    so would the probability be about 50.9 % ?

    just trying to find out if the answer in the book im reading
    is correct , so il know the formula to work out these problems in the future

    tx




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  4. #4
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    Quote Originally Posted by jickjoker View Post
    hello tx for your help plato


    so would the probability be about 50.9 % ?

    just trying to find out if the answer in the book im reading
    is correct , so il know the formula to work out these problems in the future

    tx
    Well, if the result Plato gave you is equal to 0.509 (to three decimal places) then I suppose the answer is yes (although I detest probability being expressed as a percentage).
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