This is confusing because where it says the P (B) is .60 the B has a line over it...I'm not clear what that means and I don't know how to put that into my calculator. The intersection is represented by upside down U and the union is represented by a regular U. When I put the P(.60 intersection .40) in the calculator, it gives me a question mark in front of the .40 which I'm thinking might have something to do with the fact that the B has that line above it....