Of the nine bottles, four are blue, three are white, and two are red.

Question

You remember that your wife's shampoo comes in a blue bottle. What is the probability that you get the right bottle with this additional information? Leave your answer as a fraction. I put 4/9 and got it wrong.

Answer 1

The answer should be 1/4.

 

Because the bottle with shampoo is blue one, all white and red ones are exclusive. Thus, you don't need to take care of the other colors. So you only get 1 from those 4 blue ones.

 

Hopefully it helps you.