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?

Answer 1

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.