MathAlgebraLinear algebraSystems of linear equations

Row echelon form

Sum of all elements of the matrix

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A $10 \times 15$ matrix is given. You know it is a matrix in reduced row echelon form. In addition to that, the transposed matrix is also in reduced row echelon form. Find out the maximum sum of all elements of the matrix. If it is impossible to unambiguously determine it, write down « $-1$ ».

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