$\"\"$

\

The monomials are $\"\"$ .

\

To find G.C.F.

\

Factors:

\

$\"\"$

\

$\"\"$

\

$\"\"$

\

The common prime factor is $\"\"$ .

\

The G.C.F of $\"\"$ and $\"\"$ is 4r. $\"\"$

\

The G.C.F of monomials are 4r.