Definition
If a matrix [math]A[/math] has [math]m[/math] rows and [math]n[/math] columns then the[b] order or size [/b]of the matrix [math]A[/math] is defined to be [math]m\times n[/math] ( read as [math]m[/math] by [math]n[/math] ).
The order or size of the matrix [math]A[/math] is
The order or size of the matrix [math]B[/math] is