The puzzles in this page will generally be examples of the categories I enjoy most  those involving geometry, topology, probability, and truth paradoxes. Presenting them will often involve the use of tables and figures. The page should still be readable with textbased browsers such as Lynx, provided the reader has some way of downloading and viewing gif figures.
There are now three rooms to choose from. Only one contains a lady while the other two contain tigers. The signs on the doors of the three rooms are as follows:
I A TIGER IS IN THIS ROOM

II A LADY IS IN THIS ROOM

III A TIGER IS IN ROOM II

At most one of the three signs is true. Which room contains the lady?
I A TIGER IS IN ROOM II

II A TIGER IS IN THIS ROOM

III A TIGER IS IN ROOM I

The sign on the door of the room containing the lady is true, but at least one of the other two signs is false. What should your choice be?
I ROOM III IS EMPTY

II THE TIGER IS IN ROOM I

III THIS ROOM IS EMPTY

Given that the sign on the door of the room containing the lady is true, the sign on the door of the room with the tiger is false, and the sign on the door of the empty room can either true or false, can you determine which room contains the lady? Can you also determine which room contains the tiger?
This is a similar puzzle. The triangle is, of course, an equilateral one. Once again, without indulging in any terribly complicated mathematics, determine the ratio between the areas of the two circles.
How many errors would you suspect remain, not detected by either of them?
Visit: