posted by Amanda .
An urn contains six red balls and five white balls. A sample of 2 balls is selected at random from the urn. What is the probability that at least one of the balls is red?
This is the probability of one red ball or two red balls.
One = 6/11 * 5/10 = ?
Two = 6/11 * 5/10 = ?
Either-or probability is found by adding the individual probabilities.