There are 26 black cards. There are 4 aces, but the two black ones were already counted, so we don't want to count them again. Thus, there are 26 black cards and 2 red aces, which make 28 cards that we could pull to get "an ace or a black card." There are 52 cards in a standard deck. Thus, the probability is:

28/52

This simplifies to:

** 7/13**

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