The probability of drawing an ace or a red card is 15/26.
There are a total of 52 cards in a standard deck of cards.
There are 4 aces and there are 26 red cards.
The probability of drawing an ace is 4/52.
The probability of drawing a red card is 26/52.
The probability of drawing either an ace or a red card is the sum of these two probabilities.
The sum of these two probabilities is 4/52 + 26/52 = 30/52 = 15/26.
Therefore, the probability of drawing an ace or a red card is 15/26.