Question

A bag contains 4 red marbles and 5 blue marbles. What is the probability of randomly selecting a blue marble and then, without replacing it, selecting a red marbleA bag contains 4 red marbles and 5 blue marbles. What is the probability of randomly selecting a blue marble and then, without replacing it, selecting a red marble

Answer 1

R means red marbles, B means blue marbles. Wish you can understand the meaning of this picture！(￣︶￣)

Answer 2

Answer:
`(5)/(18)`

Explanation:

P(blue) = 5 blue out of 9 total =
`(5)/(9)`

P(red) = 4 red out of 8 remaining =
`(4)/(8)` =
`(1)/(2)` simplified

P(blue) and P(red)

`(5)/(9)` x
`(1)/(2)`

=
`(5)/(18)`