Three ants are walking in the same direction. The first ant has two ants behind him, the second ant has one in front and one behind, but the third ant has one in front and one behind too. How is this possible if there were only three ants?
Answer
The ants are in a circle. Lets say the ants are A, B and C. A has B in front and C behind, B has A in front and C behind, and C has B in front and A behind.