Mathematics, 04.08.2021 17:50, BeautyxQueen

A 21x21 table contains 21 copies of each of the numbers 1, 2, 3 ,..., 20, 21. The sum of all the numbers above the main diagonal (diagonal from the top-left cell to the bottom-right cell) is equal to there times the sum of all the numbers below the main diagonal. Find the sum of all the numbers on the main diagonal of the table.

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A 21x21 table contains 21 copies of each of the numbers 1, 2, 3 ,..., 20, 21. The sum of all the num...