Question

Joe has a bag of marbles. There are 2 purple, 1 red, and 3 green marbles in the bag. Joe selects a marble, does not replace it before selecting a second marble. What is the probability that Joe will select a green marble, then a red marble?

Answer 1

1/10

Explanation:

There are 6 marbles in the bag. 3 out of 6 are green.

3/6 = 1/2

So, he has a 1/2 of picking a green marble.

After getting a green marble, Joe doesn’t replace it meaning there are now only 5 marbles in the bag.

Since there’s one red marble in the bag the chance of trying one is 1/5.

Now to find the chance or drawing a green and red marble you need to do the equation:

1/2 x 1/5

This equals 1/10.

The probability is 1/10