# Unlocking the World of Probabilities!

## What is the addition rule for probabilities used for?

A. Calculating the probability of the union of events

B. Calculating the probability of the intersection of events

C. Calculating the probability of independent events

Final answer: A. Calculating the probability of the union of events

Probabilities play a crucial role in understanding and predicting outcomes in various scenarios. The addition rule for probabilities is a fundamental concept that helps us determine the likelihood of the union of two or more events occurring. When we want to find the probability of either event A or event B happening, we use the addition rule.

The addition rule states that the probability of the union of two events A and B is equal to the sum of their individual probabilities minus the probability of their intersection. This formula can be expressed as: P(A OR B) = P(A) + P(B) - P(A AND B).

By utilizing the addition rule, we can analyze the combined probabilities of different events and make informed decisions based on the likelihood of certain outcomes. It's an essential tool in the world of probabilities that unlocks a deeper understanding of how events interact and influence each other.