Can someone please explain this problem?

*that K must be selected

@AnnaC, happy to help. We are told that O is selected for the first Sunday. Rule #4 states: J and O -> J - O. The contrapositive of this is: O - J -> NOT J or NOT O. Basically, this means that if both J and O are selected, J must precede O. If O would precede J, then they cannot both be selected. In this scenario, we know O is selected and is in spot 1, which means it would be impossible for J to be earlier than O. Therefore, J cannot be selected in this scenario. The game setup tells us that exactly two of Giuliani's three concertos will be selected. Since we just eliminated J as an option, this means that the remaining two of Giuliani's concertos - H and K - must be selected. So, we can accurately say that K must be selected if O is selected for the first Sunday. Does that make sense? Please let us know if you have any other questions and best of luck with your studies!

Why is N also not the right answer since we also need two of R's concertos?

I don't understand how it's possible to have O without having J. Rule #2 states M -> NOT J & NOT O, correct? With this being an in/out game, I took that to mean that J and O must always be together, whether they are both in or both out...the reason being that if M is chosen then J nor O can be chosen AND if M is not chosen then J and O must be chosen in order to avoid either J or O being in the same category as M. Can someone please explain to me what I'm missing?

The rule is that if M is in J and O must be out. This tells us nothing about what happens if m is out. It's possible that if m is out then both j and o are in, that only one is in and the other is out, and that they're both out. J and O are not a block, there's no issue with M being together with either J or O in the out category, only with them being together in the in category.