$\"\"$

The matrix is $\"\"$ .

Find $\"\"$ .

Observe the matrix $\"\"$ ,

It has $\"\"$ rows and $\"\"$ columns.

Since $\"\"$ is the element in row $\"\"$ , column $\"\"$ .

Thus, the value of $\"\"$ is $\"\"$ . $\"\"$

$\"\"$ element is $\"\"$ .