Algebra 2 Common Core

The probability of getting a $2$ when a standard number cube is rolled is $\dfrac{1}{6}.$ Also, the probability of getting a $3$ when a standard number cube is rolled is $\dfrac{1}{6}.$ Adding these probabilities, then the probability of getting a $2$ or a $3$ is \begin{align*}\require{cancel} & \dfrac{1}{6}+\dfrac{1}{6} \\&= \dfrac{2}{6} \\&= \dfrac{\cancel2^1}{\cancel6^3} &\text{(divide by $2$)} \\&= \dfrac{1}{3} .\end{align*} Hence, Choice B.