November 4th, 2009, 04:24 PM
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Quote:
Originally Posted by spred  Problem:
In the cartesian plane, consider the set of points
A={(i,j)|0<or=i,j<or=40, with i and j integers}
How many squares can be formed so that all corners of all squares belong to A, with sides parallel to the x and y axes? | Do you know about the sum of squares? |