$\"\"$

Associative Property of Matrix Addition is true for $\"\"$ matrices,

Let, $\"\"$ , $\"\"$ and $\"\"$ .

Find $\"\"$ .

$\"\"$ (Substitute $\"\"$ , $\"\"$ and $\"\"$ )

$\"\"$ (Definition of matrix addition)

$\"\"$ (Associative property: $\"\"$ )

$\"\"$ (Definition of matrix addition)

$\"\"$

Therefore, Associative Property of Matrix Addition is true $\"\"$ .

$\"\"$

Associative Property of Matrix Addition is true $\"\"$ .