Question

Jenna has a bag that contains 7 red marbles and 25 blue marbles. She selects a marble at random, and then, without replacing the first one, selects another marble at random.

What is the probability that Jenna selects a blue marble and then a red marble? Round your answer to the nearest percent.

Answer 1

Probability to get a blue marble first =
`(25)/(25+7) = (25)/(32)`

Probability of getting a red marble next =
`(7)/(32-1) = (7)/(31)`

Total probability =
`(25)/(32)* (7)/(31) = (175)/(992)`

Percentage probability =
`(175)/(992) *100= 17.6`

Answer 2

I think the answer is somewhere above 50%