Question

The number of marbles of different colors stored in a hat is listed below:

1 red marble
8 green marbles
9 blue marbles
Without looking in the hat, Ray takes out a marble at random. He replaces the marble and then takes out another marble from the hat. What is the probability that Ray takes out a blue marble in both draws?
1 /9
1 / 8
1 / 4
1/2

Answer 1

@Vocaloid

Answer 2

1/2

Answer 3

Add the probabilities together, what do you get?

Answer 4

Since there are 9 blue marbles and that's half as many marbles in the bag

Answer 5

almost, but not quite

I agree that the probability of getting one blue marble is 1/2
however, the problem is asking for two marbles, so we multiply

(1/2)*(1/2) = ?

Answer 6

0.25

Answer 7

as a fraction, please

Answer 8

1/4

Answer 9

yup, that's our final answer

Answer 10

thanks!