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Class 12 maths solutions  Matrix In this article, ‘Matrix’ from CBSE Class 12th Maths is being discussed. Matrix:  A matrix is an ordered array of numbers (or functions). The numbers (or functions) are called the elements or the entries of the matrix. The horizontal lines of elements are said to form rows of the matrix and the vertical lines of elements are said to form columns of the matrix. Eg. In this example, we have two rows and three columns. Order of a Matrix:  A matrix having m rows and n columns are called a matrix of order m × n. In above example, the order of matrix is 2×3 since there are two rows and three columns. Let us take a matrix The order of this matrix is 3×3. In general, we use the notation    [a ij ] m×n    to indicate a matrix of order m × n. Here      i= 1,2,….,m  and j= 1,2,…,n. Here a 11  indicates the element corresponding to the 1 st  row and 1 st  column. Similarly, a 32  means element corresponding to the 3 rd  row and 2