The probability is 0.25
If it is an ordinary pack of playing cards then the probability is 0.5
It is 1/52.
1 in 52
13/52 = .25
The probability of picking a black ace in one random draw from a normal pack of playing cards is 1/26.
1/2 or 0.5.
There are 4 kings in a pack of 52 cards so the odds are 1:13 (4/52).
For a single card, picked at random from a well shuffled normal pack the probability is 3/13.
The probability of drawing an Ace from a standard deck of 52 cards is 4 in 52, or 1 in 13, or about 0.07692.
1 in 52, or 0.01923
4 out of 52