# When do you add probabilities?

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When they pertain to mutually exclusive possible outcomes.

Explanation:
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 $\frac{1}{6}+\frac{1}{6}=\frac{1}{3}$