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Matrix:
Now, we write formal definition of Matrix.
An arrangement of number into m-rows and n-columns is called a Matrix of order  .
Matrix always denoted by capital letters A, B, C,… , whereas their elements or entries by small letters a, b, c,…
e.g.
This form of matrix is called matrix in tabular form, matrix can also be written in short form or abbreviated form as
Order Of a Matrix:
The number of rows and number of columns in a matrix, is called arder of the matrix, denoted by  or  . Where  number of rows,  number of columns.
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