Assuming you're drawing from a complete shuffled 54-card deck, chances are one in twenty-seven.
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Probability of getting a King is 4/52 = 1/13. Having drawn the King, for it to be a Red King, the probability is 2/4 = 1/2. Hence the conditional probability is (1/13)x(1/2) = 1/26
The probability of drawing a red heart is 1 in 4. This is the same as the probability of drawing a heart, as red is included as a superset of hearts.
1/52
The probability of getting a diamond and a black seven is zero. Diamonds are red.
If there is 3 blue 2 red and 4 green. What is the probability of getting green?