He is not the limiting factor in this, assume he knows everything about math. (or she)winneratlife wrote: Given that the guard knows all about math, doesn't this make it impossible? That was my first thought.
I'm going to assume that the "I don't know" fits with 1 though...
The I don't know can fit with all three, though I usually see it with 2, and sometimes 3, I don't think I've seen it with 1 but it definitely could.