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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- Aug 4th 2009, 11:08 AMjickjokerfancy 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.?** - Aug 4th 2009, 11:35 AMPlato
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:

$\displaystyle \frac{3\binom{9}{3}}{\binom{12}{4}}$. - Aug 5th 2009, 10:46 AMjickjokerhello 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

- Aug 6th 2009, 05:53 AMmr fantastic