**(I) BASICS**

**Matrix** is a rectangular array of numbers. The array may consist of m rows and n columns enclosed in brackets. Such an array is called m by n matrix. A matrix [A] consisting of m rows and n columns is written as

In the above form, the numbers a _{ij} are called the **elements** of the matrix A. The first subscript i denotes the row and the second subscript *j* denotes the column in which the element *a*_{ij} appears. The matrix is called **square** matrix when the number of rows m is equal to the number of columns *n* (*m* = *n*). Such a matrix is called a **square matrix of order n.**

**Column Matrix** is a matrix comprising of only one column. ...

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