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- #1

- Feb 7, 2012

- 2,799

I found a solution, more or less by trial and error. I don't know if there is a more systematic way to tackle it.Can anyone figure out this problem ? I have tried many ways and can find no solution.

Put the following numbers into the grid so that no single digit appears more than once in any row, column, or main diagonal.

10,12,13,21,34,38,40,47,50,53,57,64,65,78,89,98

The 'grid' is 4 rows of 4 boxes each, stacked on top of each other.

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