## Intro to Probability

Summary

The essence of probability in the GRE context is explored, emphasizing its definition as a ratio, the significance of randomness, and basic strategies for solving probability problems.

- Probability is fundamentally a ratio or fraction, representing the number of successes over the total number of outcomes, and must fall between 0 and 1.
- A probability of 0 signifies impossibility, while a probability of 1 indicates certainty, with most real-world probabilities lying somewhere in between.
- The concept of randomness in mathematics implies that while individual events are unpredictable, the overall pattern of events is predictable.
- Simple probability problems can sometimes be solved by listing all possible outcomes, though this method is not always feasible for more complex questions.
- Future discussions will introduce more abstract and general rules for solving probability problems beyond the basic strategy of listing.

Chapters

00:05

Understanding Probability

00:56

The Range of Probability

03:33

The Concept of Randomness

02:04

Basic Probability Strategies