Question 18The faces of each of two fair dice are numbered $1,$ $2,$ $3,$ $5,$ $7,$ and $8.$ When the two dice are tossed, what is the probability that their sum will be an even number?$\displaystyle \dfrac{4}{9}$$\displaystyle \dfrac{1}{2}$$\displaystyle \dfrac{5}{9}$$\displaystyle \dfrac{3}{5}$$\displaystyle \dfrac{2}{3}$