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Brain-teaser - February 2001

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Using each of the numerals 1 to 9 once only, arrange them so that the sum of each of the 8 vertical, horizontal or diagonal lines in the grid to the left equals 15. Prove that there is only one solution.

Please send your answer by e-mail. The best solution will be published in March.


Give in? Want to check your answer? Follow the link to the solution.

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