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PUZZLET 087

A Matrix of Triangular Numbers

Twelve digits are arranged in a 4 x 3 matrix, forming four 3-digit integers by reading down, and three 4-digit integers by reading across. All seven integers are triangular numbers.

Your task: Reproduce the matrix, replacing the letters A through M with digits.

(Note: there is only one solution).
                  
Matrix


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Last Updated: January 13th, 2010.