Hi Amy,

Before getting a hint, please look back at the example problem we did in class about the prisoners and guards. Remember we wrote out some small examples to see if we could notice a pattern and why that pattern occurs.

Try looking at the first 10 prisoners, which are set free? For those set free, which guards authorized to lock their cell?

Let us know if you have more questions, but I want to make sure you've tried a few things first.