# When do you add probabilities?

For example, the probability of rolling a "2" on a six-sided die is $\frac{1}{6}$, the probability of rolling a "3" is $\frac{1}{6}$ and the probability of rolling a "2" or "3" is $\frac{1}{6} + \frac{1}{6} = \frac{1}{3}$.