If A is a 2 - rowed square matrix and │A│=6 then A . adjA = ?A.\(

1.	If A is a 2 - rowed square matrix and │A│=6 then A . adjA = ?A.\(\begin{pmatrix}6&0 \\0 &6\end{pmatrix}\)B.\(\begin{pmatrix}3&0 \\0 &3\end{pmatrix}\)C.\(\begin{pmatrix}1&0 \\0 &1\end{pmatrix}\)D. None of these
Answer» (adj A) = │A│I = 6\(\begin{pmatrix}1&0 \\0 &1\end{pmatrix}\) = \(\begin{pmatrix}6&0 \\0 &6\end{pmatrix}\)

If A is a 2 - rowed square matrix and │A│=6 then A . adjA = ?A.\(\begin{pmatrix}6&0 \\0 &6\end{pmatrix}\)B.\(\begin{pmatrix}3&0 \\0 &3\end{pmatrix}\)C.\(\begin{pmatrix}1&0 \\0 &1\end{pmatrix}\)D. None of these

Answer»

(adj A) = │A│I

= 6\(\begin{pmatrix}1&0 \\0 &1\end{pmatrix}\)

= \(\begin{pmatrix}6&0 \\0 &6\end{pmatrix}\)