Answer
$\frac{1}{2}$
Work Step by Step
P(event)=$\frac{numberoffavorableoutcomes}{numberofpossibleoutcomes}$
There are 6 possible outcomes. There are 3 even numbers(2,4,6) so 3 is the number of favorable outcomes.
P(event)=$\frac{numberoffavorableoutcomes}{numberofpossibleoutcomes}$
P(even numbers)=$\frac{3}{6}$ -simplify-
P(even numbers)=$\frac{1}{2}$