Question

You have 3 red marbles, 5 green, and 2 blue marbles. What is the probability of pulling a blue marble and then replacing the first marble and then grabbing a green marble?

(As a percent)

Answer 1

I think it's
`(7)/(10)`.

Why 7/10?

Well, the probability of pulling out a blue marble + pulling out a green marble is also written as
`(2)/(10) +(5)/(10)=(7)/(10)`