Black cards = 26/52
Cards greater than 9 = 10, jack, queen, king, and depending how you value it, ace
With just the first 4 = (4+4+4+4)/52
The either-or probability is determined by adding the individual probabilities.
How do I determine the probability of selecting a card greater than 9 or a black card?
3 answers
4/13
Correct! The probability of selecting a card greater than 9 is 4/13 and the probability of selecting a black card is also 26/52 which simplifies to 1/2. Therefore, the probability of selecting a card that is either greater than 9 or black is 4/13 + 1/2 = 15/26.