Knowing the probability rules is key for computing and relating probabilities. These quizzes explore the fundamental rules which are applied throughout the rest of the Exploration:

- Rule of Sum (for exclusive events): \[P(A\text{ or }B) = P(A) +P(B)\]
- Rule of Product (for disjoint events): \[P(A\text{ and }B) = P(A)\cdot P(B)\]
- Rule of Complement: \[P(\text{not }A) = 1-P(A)\]
- Principle of Inclusion-Exclusion: \[P(A\text{ or }B) = P(A)+P(B)-P(A\text{ and }B)\]

By the end of the chapter, you'll be able to apply the rules in combination to solve problems like this one:

Assuming that rain across the days is independent, what is the probability that it will rain **at least once** in these five days?

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