1. ## 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.?

2. 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:
$\frac{3\binom{9}{3}}{\binom{12}{4}}$.

3. 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

4. Originally Posted by jickjoker
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).