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label Mathematics
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Oct 21st, 2017

It is not possible because the sum of 1 to 9 is 45 and so each row cannot sum to 12.

Sum to 15 is possible

8 1 6

3 5 7

4 9 2 

Aug 22nd, 2014

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Oct 21st, 2017
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Oct 21st, 2017
Oct 21st, 2017
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