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Mathematics, 22.11.2020 20:50 trevorhenyan51

Numbers 1, 2, 3, ..., 49 are written in the cells of 49×49 square, and the following holds: In every pair of cells that are symmetrical with respect to the main diagonal the same numbers are written;
In any row and in any column all the numbers are distinct.
What is the sum of all the numbers on this diagonal?

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