Hello Faith,
There are four Queens and four Aces in a standard deck of 52 cards, and the events are mutually exclusive,
⇒ the probability is (4 + 4) / 52 = 8/52 = 2/13.
Using formal notation, it would look something like:
P(Q ∪ A) = P(Q) ∪ P(A) = 4/52 + 4/52 = 1/13 + 1/13 = 2/13.
Hope the above helps.
Thank you for the question, and posting it with Wyzant.
Michael Ehlers