Question

If You choose a card at random, what is the possibility of choosing an ace or a heart?

Answer 1

RE-POSTING MY PREVIOUS ANSWER
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there are 13 hearts in every deck as well as 4 aces making 17 cards. However, you are counting the ace of hearts twice so you are trying to choose 16 cards out of 52.
So, the probability equals
16 / 52 = 4 / 13.