#### Answer

$M \cap R = \left\{2, 4\right\}$

#### Work Step by Step

The symbol $\cap$ represents intersection of sets
The intersection of sets M and R is the set that contains all the common elements of M and R.
The elements that are common to M and R are 2 and 4.
Thus, $M \cap R = \left\{2, 4\right\}$.