Three straight slices cut a round pizza into 6 wedges. One slice is out on a plate and your friends promises that the other 5 slices are still in the box. The tip of the slice visible on the plate is a right angle. What can you *definitely* deduce about the slices left in the box?

I. At least one of the tips will be an acute angle.

II. At least one of the tips will be a right angle.

III. None of the tips will be obtuse angles.

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