Probability exactly one event occurs???

[bcahmel]

1. The problem statement, all variables and given/known data

0.42 chance eat cake, 0.56 chance eat pie. 0.16 chance eat both.Find probability that you eat exactly one of these two desserts.

2. Relevant equations
? I made a venn diagram


3. The attempt at a solution
I know how to find the probability of at least 1, but I don't understand how to find exactly one. At first I thought it would just be 0.40 + 0.26 =0.66 but I don't think this is right? So basically I just added probability eat cake + probability eat pie but I think this results in the probability or eating one or the other. So help? Please?
1. The problem statement, all variables and given/known data



2. Relevant equations



3. The attempt at a solution

[statdad]

Did you label your Venn diagram? The event "exactly 1" has probability found in the portions of the circles that are not in the intersection.

[vela]

Your answer's right. Why do you think it's wrong?

[bcahmel]

thanks! I don't know why I think its wrong- stat isn't really common sense for me unfortunately :(

[vela]

Just to clarify, your first answer is correct. I think you did something different on your second attempt.