Solve this:
Q. The faces of a dice are marked with numbers 1, 1, 2, 4, 5, 5 and that of another dice with 2, 3, 4, 5, 6, 6. Both dice are thrown together once. What is the probability that the sum of numbers on their top is even ?
(1) $\frac{1}{6}$
(2) $\frac{1}{3}$
(3) $\frac{2}{9}$
(4) $\frac{4}{9}$