Question 3A fair dice is thrown three times. The results of the first, second and third throw are recorded as $x,y,z$, respectively. Suppose $x+y=z$. What is the probability that at least one of $x,y,z$ is $2$?$\frac1{12}$$\frac38$$\frac8{15}$$\frac13$$\frac7{13}$