1. The topic you are asking about is related to \textbf{Probability of Occurrence of an Event (POM)} in probability theory. 2. The key formulas you need to know are: - Probability of an event $A$ occurring: $$P(A) = \frac{\text{Number of favorable outcomes}}{\text{Total number of possible outcomes}}$$ - Complement rule: $$P(A^c) = 1 - P(A)$$ where $A^c$ is the event that $A$ does not occur. - Addition rule for mutually exclusive events $A$ and $B$: $$P(A \cup B) = P(A) + P(B)$$ - General addition rule: $$P(A \cup B) = P(A) + P(B) - P(A \cap B)$$ 3. Important rules: - The probability of any event is always between 0 and 1 inclusive. - The sum of probabilities of all possible outcomes in a sample space is 1. - Events can be independent or dependent, which affects how you calculate combined probabilities. Use these formulas and rules to find the probability you are interested in.