The probability of at least one ace is 0.341.
We have four aces in a deck. If you take those aces, you’re left with 48 cards. The total hands of these 48 cards are 1,712,304. We subtract that number from the total number of hands in a deck, 2,598,960, and get 886,656 (total combinations with an ace).
We divide the 886,656/2,598,960 and we get the 0.341.