math jokes 4 mathy folks
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:: Miscellany
A Latin square is an n × n square in
which n groups of n elements are divided so that there is one
element from each group in every row and every column. For example, the figure to the
left shows the (trivial) solution for a 2 × 2 square.
Arrange the 16 spheres onto the 4 × 4 square so that
there is one sphere of each color in every row and every column. Click and drag the spheres
to move them onto the grid.


How many different arrangements can you find?
Both rows and both columns contain one red and one blue sphere.
A normalized Latin square is one in which the order of the elements is the same
in the top row and the left column.