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The inclusion-exclusion formula for two events states that the probability of their union is the sum of their individual probabilities minus the probability of their intersection: $P(E \cup F) = P(E) + P(F) - P(E \cap F)$.

Conditions: E and F are events in the same probability space.

The inclusion-exclusion formula for two events states that the probability of their union is the sum of their individual probabilities minus the probability of their intersection: $P(E \cup F) = P(E) + P(F) - P(E \cap F)$.

Conditions: E and F are events in the same probability space.

The union of two events, denoted $E \cup F$, means that at least one of the events occurs. It is an inclusive 'or', meaning it includes the case where both E and F happen simultaneously.

Conditions: E and F are events in a probability space.

The union of two events, denoted $E \cup F$, means that at least one of the events occurs. It is an inclusive 'or', meaning it includes the case where both E and F happen simultaneously.

Conditions: E and F are events in a probability space.