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9-7.

​Specify the dimensions of each matrix.

2 rows by 3 columns array, labeled dimensions: 2 by 3, first row: a, b, c, second row: d, e, f, left side of array, labeled in red, rows, with 2 horizontal right arrows, going through each row, top side of array, labeled in blue, columns with 3 vertical down arrows going through each column.