Question

If I have a bag with 3 red, 4 white, 1 green, and 2 blue marble. What is the probability that I choose and keep a red marble and then pick a blue marble? (Answer as reduced fraction.)

Answer 1

1/15

Explanation:

Total number of marbles: 3 + 4 + 1 + 2 = 10

First pick:

p(red) = 3/10

Now there are a total of 9 marbles.

Second pick:

p(blue) = 2/9

Overall probability:

p(red then blue) = 3/10 * 2/9 = 6/90 = 1/15

Answer 2

because red is colour which attracts more