Webwork Problems - 2.4 Equally Likely Outcomes

Equally Likely Outcomes - Multi Scenario Combination Tennis Balls

A bucket containing orange tennis balls and yellow tennis balls from which 5 balls are selected at random, but assume that the bucket contains 7 orange balls and 6 yellow balls.
(1) What is the probability that, of the 5 balls selected at random, at least one is orange and at least one is yellow?
(2) What is the probability that, of the 5 balls selected at random, at least two are orange and at least two are yellow?

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