pre calculus
posted by king chris .
A bag contains 4 blue marbles, 2 black marbles, and 3 red marbles. If a marble is randomly drawn from the bag, what is probability that it is not black?
1/2
2/9
5/9
7/9
14/19

since 2 of the 9 marbles are black,
p(~black) = 1p(black) = 12/9 = 7/9