FINDING ADJOINT OF A MATRIX EXAMPLES

Let A be a square matrix of order n.

The adjoint of square matrix A is defined as the transpose of the matrix of minors of A. It is denoted by adj A.

Here, 

Mij is the minor of aijth element of the given matrix.

Adjoint of square matrix A of order 3 is given below :

Find the adjoint of the following matrices :

Example 1 :

Solution :

Example 2 : 

Solution :

Example 3 : 

Solution :

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