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A set of mn numbers (real or complex) arranged in the form of a rectangular array having 'm' rows & 'n' columns is called an m × n matrix. [to be read as m by n matrix].
It is usually written as
It is represented as A = [aij]m × n
The numbers a11, a12… etc are called elements of the matrix. The element aij belongs to ith row and jth column.
e.g. A = is a 3 × 3 matrix.