The answer depends on
There is no information on any of these aspects and so a proper answer to the question is not possible.
However, if you assume that a single card is drawn at random from a normal deck of cards, the answer is 4/52 = 1/13.
It is 1/52.
1 in 52, or 0.01923
The probability is 0.25
The probability of picking a black ace in one random draw from a normal pack of playing cards is 1/26.
The probability of picking one red card of a deck of 52 playing cards is 26 out of 52, or 1 out of 2.
If it is an ordinary pack of playing cards then the probability is 0.5
there are 4 1's or aces in a pack of 52 cards. Probability of picking an ace=4/52=1/13
1 in 52
13/52 = .25
1/2 or 0.5.
The probability of pulling a four of diamonds from a standard deck of playing cards with the jokers removed is 1:52, the same as pulling any other individual card from the deck.
For a single card, picked at random from a well shuffled normal pack the probability is 3/13.