# Concept of Matrices

Matrix:
Now, we write formal definition of Matrix.
An arrangement of number into m-rows and n-columns is called a Matrix of order $m{\text{x}}n$.
Matrix always denoted by capital letters $A,B,C, \ldots$ whereas their elements or entries by small letters $a,b,c, \ldots$
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 order of the matrix, denoted by $m{\text{x}}n$ or $(m,n)$. Where $m =$ number of rows, $n =$ number of columns.