He stated that the number could be anything at all, that is anything from -∞ to +∞. Thus the chance of guessing right is 1/∞; that is 0.
(EDIT: oh, correction, he said no negative numbers so it's only 0 to +∞. The chance is the same though.)
So my guess is 0.
(EDIT: oh, correction, he said no negative numbers so it's only 0 to +∞. The chance is the same though.)
So my guess is 0.