Posted by Madison on .
How do I determine the probability of selecting a card greater than 9 or a black card?

Probability 
PsyDAG,
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 eitheror probability is determined by adding the individual probabilities.