Since half of the cards (26 of the 52) are a red card (hearts and diamonds) the odds are 1 in 2 (or 50%) that any given card will be red.
3 out of 13
In a normal deck of cards, it is 1.
It is 3/13.
12/52nd
If you pick enough cards, the probability is 1.
The probability of picking one red card of a deck of 52 playing cards is 26 out of 52, or 1 out of 2.
The probability of picking a diamond out of a standard deck of 52 cards is 13 in 52, or 1 in 4, or 0.25.
3 out of 13
If you pick 37 cards without replacement, or pick a card from the bottom of a mint deck, the probability is 1: it is a certainty. If you pick a random card from a deck, then the probability is 4/13.
In a normal deck of cards, it is 1.
1/52
It is 3/13.
12/52nd
The probability that a single card, drawn at random, is a 9 is 1/13.
The probability of picking a 23 of hearts in a standard 52 card deck of cards is zero, because there is no 23 of hearts. If you meant to ask about the probability of picking a 2 or a 3 of hearts, then the probability is 2 in 52, or 1 in 26, or about 0.03846.
If you pick enough cards, the probability is 1.
If you pick enough cards, the probability is 1. For a single card, picked at random, the probability is 1/13.