A restrained flea jumps one foot at a time either north, south, east or west. At how many different places could he end up after 8 jumps?
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Think of the flea on a coordinate grid starting at the origin. If the flea only jumps in one direction it would end up at either (0,8), (8,0), (0,-8) or (-8,0).
Now consider the possible points in the first quadrant, (x,y) where x is the number of jumps east minus the number of jumps west and y is the number of jumps north minus the number of jumps south. It is probably a good idea to sketch these points on some graph paper and you will see the pattern created by the locations. Multiply the number of points in the first quadrant by four and add the ‘return-to-origin’ possibility to find the total.
The answer is 81 different places.
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