Question 1176196
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In mathematics, a square matrix is said to be diagonally dominant if, for every row of the matrix, 
the magnitude (absolute value) of the diagonal entry in a row is larger than or equal to the sum 
of the magnitudes (absolute values) of all the other (non-diagonal) entries in that row.



See this Wikipedia article

https://en.wikipedia.org/wiki/Diagonally_dominant_matrix



Having this definition, provided to you, YOU do the rest.