Posted by B1nary on .
Using a standard deck of 52 cards find each probability.
1.)King, queen, or black card
2.)Spade or hearts card

Math Probability 
Reiny,
I will assume you are drawing one card
number of favourable outcomes
= 4 kings + 4 queens + 26 black cards  2black kings  2black queens
= 30
prob(king or queen or black card ) = 30/52 = 15/26
spade or hearts = 13 + 4  1 = 16
prob = 16/52 = 4/13