In a random selection from a full deck of playing cards, it is 1/2. Otherwise it could be almost anything.
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There are 13 of each suit in a standard deck of cards. Assuming there are no jokers, the probability of picking either a club or a diamond is (13+13)/52 or 0.5. There are also four aces in a standard deck. However, we've already accounted for two of them (the ace of clubs and the ace of diamonds), so we're only adding two additional possibilities. The probability of choosing an ace, a club, or a diamond from a standard deck is therefore 28/52 (you can figure the decimal value yourself).
1/2 or .50. Of the 52 cards, 26 are either a heart or a diamond (there are 13 hearts, 13 diamonds, 13 clubs and 13 spades).
If you mean chosing both cards - the odds are 1 in 169. If you mean chosing either a king or a queen - the odds are 1 in 13
The probability is 11/13.
On one random draw, the probability is 2/13.