Carla is going to draw a marble from the bag shown below, replace it, and then draw another marble. What is the probability that Carla will get a green or yellow marble on the first draw and a blue on the second draw?
(3 green, 4 yellow, 5 blue, 8 pink)

Question

Carla is going to draw a marble from the bag shown below, replace it, and then draw another marble. What is the probability that Carla will get a green or yellow marble on the first draw and a blue on the second draw?
(3 green, 4 yellow, 5 blue, 8 pink)

anonymous · Answer

there's a total of 20 marbles, and they get placed back after being drawn, so the value will always be 20 and the ratio will always stay the same. 

there's 3$\color{green}{green}$ and 4$\color{yellow}{yellow}$ marbles out of 20, how much change does she have to draw either?

then, once these criteria have been met, how much chance for one of the 5 $\color{blue}{blue}$ marbles?