Question

Which elements form the diagonal of a square matrix?

Options

• \[a_{21},a_{32},\dots,a_{n,n-1}\]

• All non-diagonal elements

• \[a_{11},a_{22},\dots,a_{nn}\]

• \[a_{12},a_{23},\dots,a_{n-1,n}\]

Answer 1

The diagonal consists of entries whose row number equals their column number. These entries are \[a_{11},a_{22},\dots,a_{nn}\].