I calculated this assuming you do not have jokers in the deck.
Getting a red card is easy because that is half the deck. 50% chance or 1/2 chance of getting a red card on the next drop. If its a heart or a diamond (specifically) you are looking for its a 25% or 1/4 chance. (also a 75% or 3/4 chance it WON'T be the suit you are looking for)
Next is the Kings. 52 (cards in a deck) divided by 100 is 0.52. 0.52 multiplied by 4 (four kings in a normal deck) is 2.08. So at all times a 2.08% chance a king will drop. Keep in mind the opposite is true, that there is like 97.92% chance that a king wont drop. The "odds" of this are approximately 2/100 or 1/50. Someone please feel free to correct me and my math.
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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.
If you pick enough cards, the probability is 1.
The probability of drawing a king or a red card from a standard deck of 52 cards is (4 + 26 - 1) in 52, or 29 in 52, or about 0.5577. There are four kings and 26 red cards, of which one is a king. Simply count the number of desired outcomes (29) and divide by the number of possible outcomes (52).
1 out of 26.
In a normal deck of cards, it is 1.