MATH STINGER #23 
by Dr. Joel C. Fowler 
Assistant Professor of Mathematics 

Another type of counting problem provides a new puzzle. 
Suppose that you are standing at the northwest corner of a 6 by 6 grid of city blocks. 
How many different routes are there to the southeast corner of the grid if you may only 
move east and south along streets? How many of these routes pass through the intersection 
that is in the exact center of the grid? The hint given for the domino covering puzzles can be 
applied here as well (although there are other solution methods).

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