Question

There are 9 red gumballs, 5 green gumballs, 8 yellow gumballs, and 8 blue gumballs, what is the probability of choosing green then yellow. please explain how you got your answer.

Answer 1

9+5+8+8=30  <-- all balls

The probability of choosing green ball is $\dfrac{5}{30}=\dfrac{1}{6}$
The probability of choosing yellow ball is $\dfrac{8}{30}=\dfrac{4}{15}$

So, the probability of choosing green ball and then yellow one is $\dfrac{1}{6}\cdot\dfrac{4}{15}=\dfrac{2}{45}$