Question

Suppose you choose a marble from a bag containing 3 red marbles, 5 white marbles, and 4 blue marbles. You return the first marble to the bag and then choose again. Find P(red and blue).

Answer 1

how many total marbles are in the bag?

Answer 2

12

Answer 3

of those 12 marbles how many are red

Answer 4

3

Answer 5

so that gives you a probability of what?

Answer 6

3/12

Answer 7

ya which simplifies to 1/4

Answer 8

then if we put that back in our total is still 12 and then how many blues do we have?

Answer 9

1/12, 7/12, 1, 2/3 are my choices

Answer 10

ok but what is the probability of getting a blue marble?

Answer 11

4/12

Answer 12

ok so now multiply 1/4 by 1/3

Answer 13

1/12

Answer 14

yup

Answer 15

thanks

Answer 16

np let me know if you have any questions