P(1 blue) = P(blue,other)+P(other,blue)
= 4/12 * 8/12 + 8/12 * 4/12 = 64/144 = 4/9
There is a bag filled with 4 blue, 3 red and 5 green marbles.
A marble is taken at random from the bag, the colour is noted and then it is replaced.
Another marble is taken at random.
What is the probability of getting exactly 1 blue?
1 answer