Sorry

This answer is incorrect.

In this problem you are dealing with the probability of two separate events. When dealing with the probability of separate events you need to find the probability of each event happening and then multiply the probabilities together.

There are 4 glazed + 3 cream-filled + 2 jelly doughnuts = 9 doughnuts altogether

Therefore probability of selecting a cream-filled doughnut is 3 out of 9 or 1 out of 3

Then you eat the doughnut, now there are only 8 doughnuts left in the box.

This time you want to get a glazed doughnut. There are 4 glazed doughnuts so the probability of selecting one is 4 out of 8 or 1 out of 2.

Now you need to multiply the two probabilities.

1/3 * 1/2 = 1/6

Now let us try another one

Socks are chosen at random from a drawer containing six red socks and three green socks. What is the probability of choosing a red sock, setting it on top of the dresser, and then choosing a green sock?

• 4/9
• 5/9
• 1/4
• 5/12

Web Related: David.Mazza@grc.nasa.gov
Technology Related: Thomas.J.Benson@grc.nasa.gov
Responsible NASA Official: Theresa M. Scott (Acting)