Question

Which elements can be non-zero in a diagonal matrix?

Options

• All elements outside the diagonal

• Only \[a_{11},a_{22},\dots,a_{nn}\]

• Only elements in the first row

• Only non-diagonal elements

Answer 1

The possible non-zero entries of a diagonal matrix are its diagonal elements. These are \[a_{11},a_{22},\dots,a_{nn}\].