How do I determine the probability of selecting a card greater than 9 or a black card?

Answer 1

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.

Answer 2

4/13

Answer 3

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.