If the order of the product matrix $AB$ is $k\times 3$(write in $m\times n$ form), given the orders of $A \text{and} B$ as

Order of $A$	$3\times 3$
Order of $B$	$3\times 3$

Then find the value of $k$.

If the order of the product matrix $AB$ is in the form $m\times n$, given the orders of $A \text{and} B$ as

Then value of $m+n=$

If the order of the product matrix $AB$ is $m\times n$, given the orders of $A \text{and} B$ as

Then $m+n=$

If the order of the product matrix $AB$ is in the form of $m\times n$, given the orders of $A \text{and} B$ as

then $m+n=$

If the order of the product matrix $AB$ is $k\times 3$, given the orders of $A \text{and} B$ as

Then find the value of $k$.