Equiprobable Events: Events with equal chances of occurring. For example, a fair six-sided die, each face has a probability of 1/6 of landing face-up.

Addition Rule for Probability: For mutually exclusive events (events that can’t occur simultaneously), the probability of A or B is the sum of their probabilities. E.g., P(Blue or Red) = P(Blue) + P(Red).

Understanding Expected Frequency: Expected values are estimations; actual outcomes may vary.

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