Yeah but it's not given that God chooses at random who is going to cubicle. He might have for example created you first and then put you in a cubicle regardless if it's 100 of them or 10. I agree with your resolution of that paradox though. It's reasonable to assume - having no information about the process - that God creates humans randomly and it's 10x more likely that you are created in a world with 100 cubicles than in a world in 10 cubicles. In my mind there is no paradox at all there.