Question

A square matrix `A=[a_(ij)]` in which `a_(ij)=0` for ` i!=j` and `[a]_(ij)=k` (constant) for `i=j` is called a
A. unit matrix
B. scalar matrix
C. null matrix
D. diagonal matrix

Answer 1

Correct Answer - B
in square matrix ,
Number of rows = number of columns
`therefore m=n`