A six-sided number cube, you say? Hmm, six-sided...there's a clue in there somewhere. And each of the SIX sides has a different NUMBER on it, you say? So there are SIX different NUMBERS to choose from. Wow, I can see why that one would make you scratch your head. You think about it for a couple of hours and let me know if you are still having trouble then.
John
My calculator said it, I believe it, that settles it