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### Tim Mitchell says

I have no idea said with a smile. Quite honestly I had never heard of this puzzle until reading your post. Mind boggling to say the least for me after reading about it at Wiki. I will have to read it again as I really do not understand it yet. So, while I am happy to learn about it again I cannot answer the question :-)

Thanks Tim. Sudoka is not in fact mathematical. The symbols 1 through 9 are used because we can all recognise them. You do the puzzle equally well by substituing a set of letters.

### Sam says

According to Wikipedia (http://en.wikipedia.org/wiki/Sudoku#Mathematics_of... it is 6,670,903,752,021,072,936,960

Which is an insane number!