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.?
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:
$\displaystyle \frac{3\binom{9}{3}}{\binom{12}{4}}$.
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).